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Patrick Hynes, VP, Branch Leader Responsible for leading Fidelity's local Investor Center, offering financial and investment guidance to our customers including one-on-one retirement planning, wealth management, income strategies, and college planning services, as well as integrated employee benefits solutions. Achieving goals We can help you save for the things that are most important to you.

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Achieving goals We can help you save for the things that are most important to you. Retirement income planning Retirement doesn't mean the same thing to everyone. Your advisor can help you build a plan designed to let you retire on your own terms. Investment solutions You and your advisor will work together to create an investment plan based on your goals, your personal situation, and your preferences.

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If this skin is present over large areas, as human skin is present over whole body, then it could generate sufficient energy to power devices such as actuators used in robotics and prosthetics. Such scenarios enabled by the energy autonomous electronics skin integrated on robotic hand will be presented in the lecture along with the tasks such as grabbing of soft objects. The photovoltaic PV module directly integrated of solar conversion and electrochemical energy storage provides a new and promising insight towards solar energy utilization.

Particularly, solar rechargeable redox flow batteries SRFB offer a cost-effective and compact solution to solve the photovoltaic intermittency issues. Among, all RFB, all vanadium is the chemistry most development and most mature, being worldwide commercialized. The vanadium redox flow battery VRFB presents a standard cell potential is 1.

This operational potential is extremely high to pair with PV commercial modules, supposing a great challenge for the solar recharging process. Two approaches have been followed: 1 inexpensive Cu In,Ga Se 2 modules disposed in 3 and 4 series-connected cells, allowing the full unbiased photocharge under 1 Sun illumination. Finally, several strategies to increase the photocharge of the negative half-cell reaction in Vanadium redox flow batteries is discussed [3].

Then, she moved to the US where she spent over five years at the Lawrence Berkeley National Laboratory, first as a postdoc and project scientist at the Molecular Foundry and after as a tenure-track staff scientist in the Joint Center for Artificial Photosynthesis. She is passionate about materials chemistry, nanocrystals, understanding nucleation and growth mechanisms, energy, chemical transformations. The ability to tune thin metal oxide coatings by wet-chemistry is desirable for many applications, yet it remains a key synthetic challenge.

We compare the c-ALD with the previously developed gas-phase ALD in film to highlight its advantages which comprise the preserved colloidal dispersability, the improved optical properties and the stability. Finally, we illustrate the importance of such a finely tuned metal oxide shell thickness to study nanoscale phenomena such as energy transfer between PeQDs and CdSe nanoplates, between PeQDs and metal nanoparticles and the anion exchange reaction in PeQDs.

When conducting spectroscopy at a single particle level, due to the highly enhanced contaminants e. By using a suitable polymer matrix, these detrimental effects can be suppressed, and intrinsic exciton and multi-exciton dynamics can be explored at the single particle level. Here, we report a comprehensive investigation of the room temperature single QD optical properties. The results reveal the origin of the QD homogeneous PL linewidths, and the peculiar size-dependent exciton and multi-excitons recombination dynamics.

Such findings guide the further design of robust single photon sources operating at room temperature. Nature , — Science , — Nano Lett. At the core of the heated debate around 0D lead bromide perovskites is the origin of the green emission, which was observed in bulk powders and single crystals, but not in nanocrystals. Early speculations of an intrinsic emission of the material gradually sedimented into two main lines of thought: some groups point at deep band levels induced by point defects, most likely Br vacancies, while others claim the green emission stems from embedded CsPbBr 3 3D nanocrystals or some other lower dimensional perovskite structures, whose formation within the bulk 0D material is challenging to be discerned from XRD patterns.

Although the latest research seems to lean toward the 3D contamination induced emission, no final consensus has been achieved so far. In this work we present ab initio molecular dynamics MD simulations to study Cs 4 PbBr 6 in a wide range of temperatures from 34 K to room temperature, and we analyze the electronic structure of the system at every timestep.

We also extended the study to the 0D crystal with Br vacancies and to the 3D perovskite crystal. By comparison of the three systems, we demonstrate that point defects cannot be responsible of the green emission because we observe a fast phonon-mediated quenching mechanism of the intrinsic emission of the material already at low temperatures.

This is idea is corroborated by variable temperature photoluminescence studies on nm size non-emissive 0D NC, which lack the impurities present in powders. Unravelling the mechanisms of cooling is therefore an essential step for both understanding and developing emerging photovoltaic materials. Perovskite nanomaterials are an exciting class of compounds because they offer facile and broad optoelectronic tunability by size, dimensionality and composition. Here, we aim to elucidate the effects of these properties on carrier cooling by employing ultrafast pump-push-probe spectroscopy.

This three-pulse technique allows cooling to be isolated from a melee of other excited state processes, while also allowing independent control over the hot and cold band-edge carrier subpopulations. These experiments show that while carrier cooling is generally indifferent to nanocrystal size in moderately confined systems, intriguing results are obtained upon altering the shape of the nanocrystal, and are also influenced greatly by material composition.

Lead halide perovskite nanocrystals NCs have emerged as a potential material for LED and solar cell applications [1]. However, despite of their promising performance, the band gap of lead halide perovskite NCs remains large that limit the absorption in infrared IR part of spectrum [2]. As a short wave IR absorber, PbS NCs has attracted much attention yet it suffer with high dark current eventually that limit the device performance.

By mixing the two compounds with an optimum ratio, it is possible to preserve most of the IR absorption while the transport driven by the wider band gap of the perovskite, this enabling a dark current reduction. Using this strategy, we show that the hybrid material has an n-type nature with a charge carrier mobility of 2 x 10 -3 cm 2 V -1 s This problem is address by introducing a plasmonic resonator.

The latter relies on a grating that generate a multi passes of the light into the absorbing layer thus enhancing the IR absorption [3]. The resonant electrode enhances the light-matter coupling within the NCs film that enhance the IR absorption up to 3 times [4]. In addition, the reduction of the interelectrode spacing enable photoconduction gain leading to an improved responsivity and detectivity by two order of magnitude in comparison to pristine PbS. Colloidal nanoplatelets NPLs have recently emerged as a novel and exciting class of materials.

While several established procedures are available for highly luminescent 4. Further applications may therefore be hampered by their high surface-to-volume ratio. Here we present our work on the development of a synthesis protocol that achieves improved control over the lateral size, by exploiting a series of long-chained carboxylate precursors, varying from cadmium octanoate C 8 to cadmium stearate C The length of the metallic precursor is key to tune the width and aspect ratio of the final NPLs from to , as well as the overall reaction yield, which increases for shorter chain length.

As the width can be tuned down to 3. Via a slight adjustment, we also obtained 2. Our results contribute to achieving stable and efficient sources for applications such as blue and UV light emitting devices or lasers, or fast quantum light sources. Gradients are able to minimise crystal defects, lattice mismatch, and can be used to engineer the envelope wave function of excitons in order to suppress non-radiative Auger processes.

However, due to the small size of the particles, so far no reliable method exists to quantify the extent of such a gradient. We used EXAFS spectroscopy to determine the average coordination of selenium ions, which were fitted to a continuum model for the radial distribution of cations and anions [2].

This is significant, because many shell growth protocols that are assumed to produce sharp interfaces are performed at similar temperatures. This is explained by the formation of an ordered Zn 0. Raman spectroscopy shows selective resonant enhancement of the core LO phonon overtones, which indicates that the exciton is primarily localized in the core and at interfacial traps, and that the electronic structure flips from a type-II to a type-I system.

The high-temperature product sheds light on why some highly emissive nanocrystals still blink and struggle to reach unity quantum yield [4]. Vacancy-ordered triple perovskites have recently come under the scientific spotlight as promising materials for high-performance next-generation optoelectronic technologies.

In this work, we demonstrate a drastic shift of over 1 eV in the optical absorption onset of Cs3Bi2Br9 from 2. Through a combination of detailed theoretical and experimental characterisation of this novel material, we elucidate the origin of broadband absorption. Sn is found to disproportionate in the doped material, inducing a strong intervalence charge transfer IVCT transition, whilst preserving the structural integrity of the perovskite framework.

Our work provides valuable insight regarding the effects of mixed-valency and structure-property relationships in perovskite-inspired materials, guiding design strategies and expanding the compositional space of candidate materials. Robin Hochstrasser in After postdoctoral training with Prof. Charles B. He was promoted to associate professor in , full professor in , Winship distinguished research Professor in , and William Henry Emerson Professor of Chemistry in Sloan fellowship.

Tim Lian research interest is focused on ultrafast dynamics in photovoltaic and photocatalytic nanomaterials and at their interfaces. Photon upconversion, where two or more low energy photons are converted into one high energy photon, shows great potential in bioimaging, catalysis and solar energy conversion. Photon upconversion has traditionally been realized with lanthanide-doped nanoparticles, or organic dye sensitized triplet-triplet annihilation TTA based upconversion platforms.

In recent years, QD sensitized triplet-triplet annihilation based upconversion systems have achieved impressive upconversion quantum efficiency and demonstrated many unique advantages, including high photostability, large extinction coefficient, high spectral coverage and tunability, and low singlet-triplet energy gap. We summarize the main results of time-resolved spectroscopic studies of various factors affecting the rate of triplet energy transfer TET from the QD to the surface attached mediator TET1 and from the mediator to the emitter in solution TET2.

To identify the key design rules, we compare three PbS sensitized upconversion systems using three mediator molecules with the same tetracene triplet acceptor at different distances from the QD. Our results show that the mediator triplet state is mostly formed by direct TET from quantum dot. With increasing distance between the mediator and PbS QD, the efficiency of the TET1 from the QD to the mediator decreases due to a decrease in the rate of this triplet energy transfer step, while the efficiency of the TET2 from the mediator to emitter increases due to a reduction in the QD induced mediator triplet state decay via the external heavy atom effect.

The rate constant of TET2 is three orders of magnitude slower than the diffusion limited value. Sean T. Roberts received his BS in Chemistry from the University of California Los Angeles in and his PhD in Physical Chemistry from the Massachusetts Institute in Technology in for work using multidimensional infrared spectroscopy to study proton transport in liquid water with Andrei Tokmakoff.

In , Sean started his independent career at the University of Texas at Austin where he leads a research group that uses and develops ultrafast spectroscopic techniques to understand how the mesoscopic ordering of semiconductor nanomaterials impacts their ability to manipulate energy and transport charge.

Singlet exciton fission is a process that occurs in select organic materials wherein a spin-singlet exciton redistributes its energy to form a spin-correlated triplet exciton pair. Such systems can enable new near-infrared sensors and photocatalysts driven by low-energy light. Intrinsic to the design of any singlet fission or triplet fusion-based device, however, is the exchange of energy, typically in the form of a spin-triplet exciton, between an organic material from an inorganic semiconductor.

Hybrid materials consisting of semiconductor quantum dots functionalized with organic molecules are a premier platform for study of this energy transfer process. The high surface to volume ratio of these materials effectively means they consist entirely of interfacial molecules and the energy level tunability of quantum dots allows exploration of how the redox properties of the interface impact energy transfer. Here, we report results on both PbS and Si quantum dots interfaced with a range of acene and rylene energy acceptors.

We find that by tuning the energy level alignment of PbS quantum dots to that of rylene acceptors, the transfer of charge carriers across the interface can be varied by an order of magnitude. Interestingly, electronic structure calculations suggest this rate variation stems from electrostatic effects that both alter interfacial energy level alignment and shift the average orientation of molecules tethered to PbS.

For Si quantum dots, energy transfer to acene and rylene acceptors is decidedly slow, unfolding on nanosecond to microsecond timescales due to weak coupling. Nevertheless, this process is highly efficient due to a lack of competing deactivation pathways. Interestingly, we find subtle changes in the structure of the triplet exciton energy acceptor lead to large changes in the energy transfer rate. These rate changes are unexpected on the basis of electronic structure calculations performed on molecules tethered to Si surfaces, suggesting more exotic surface structures may play a key role in facilitating triplet energy transfer from silicon to organic molecules.

Although colloidal semiconductor nanocrystals have been widely studied for three decades, the understanding of their excited-state dynamics continues to evolve. Charge-carrier trap states on nanocrystal surfaces play an essential role in processes such as electron—hole recombination and charge transfer but their dynamics are challenging to probe spectroscopically. Photogenerated holes in CdS and CdSe nanocrystals trap to the orbitals of undercoordinated S and Se atoms on the particle surface on a picosecond timescale.

We recently presented evidence that trapped holes on the surfaces of CdS and CdSe nanocrystals are not stationary but instead undergo a diffusive random walk at room temperature. The initial evidence came from interpretation of electron-hole recombination dynamics in transient absorption TA spectroscopy data of non-uniform CdS and CdSe nanorods.

More recently, temperature-dependent TA data provided insights into the mechanisms of trap-to-trap hole hopping. The experimental data, together with theoretical insights from our collaborators Joel Eaves and coworkers, builds an increasingly precise description of trapped-hole diffusion in nanocrystals. This presentation will feature our most recent progress in this area. Cation exchange, a chemical transformation used to modify a crystal whereby a cation from solution replaces a host cation, has recently become a highly effective tool for enabling the synthesis of nanoparticles with novel chemical compositions.

In particular, aliovalent doping of CdSe nanocrystals NCs via cation exchange of cadmium ions for silver ions has become quite popular for manipulating the optical and electronic properties of the doped NCs, such as for producing n- or p-type NCs. However, despite over a decade of study, the relationship between optical properties of the NC and the aliovalent dopants has largely gone unexplained, partially due to an inability to precisely characterize the physical properties of the doped NC.

We will discuss how electrostatic force microscopy EFM with single electron sensitivity can be used to determine the charges of individual, cation-doped CdSe NCs in order to investigate their net charge as a function of added cations. While there was no direct trend relating the NC charge to the relative amount of cation per NC, there was a remarkable and unexpected correlation between the average NC charge and ensemble exciton photoluminescence PL intensity, for all dopant cations introduced [1].

We use an effective mass theoretical model to conclude that the changes in PL intensity, as tracked also by changes in NC charge, are likely a consequence of changes in the NC radiative rate caused by symmetry breaking of the electronic states of the nominally spherical NC due to the Columbic potential introduced by ionized cations.

Further, we show through energy loss spectroscopy and PL spectroscopy on individual NCs that the cation exchange process is highly heterogeneous, which has profound implications for possible future applications of doped NCs. EDLs thereby enable enhanced rates of charge carrier extraction from, and transport among, QDs and dynamic colorimetric sensing. The application of reported EDLs — which bind to the QD through thiolates or dithiocarbamates — is however limited by the irreversibility of their binding and their low oxidation potentials, which lead to a high yield of photoluminescence-quenching hole trapping on the EDL.

The magnitude of exciton delocalization induced by the NHC after scaling for surface coverage increases with increasing acidity of its pi-system, which depends on the substituent in the 4,5 positions of the imidazolylidene. Joseph M. Luther obtained B. At NCSU he began his research career under the direction of Salah Bedair, who was the first to fabricate a tandem junction solar cell. As a postdoctoral fellow, he studied fundamental synthesis and novel properties of nanomaterials under the direction Paul Alivisatos at the University of California and Lawrence Berkeley National Laboratory.

In , he rejoined NREL as a senior research scientist. His research interests lie in the growth, electronic coupling and optical properties of colloidal nanocrystals and quantum dots. Colloidal halide perovskite nanocrystals NCs have the possibility of easy scale-up due to their batch synthesis and have demonstrated excellent optoelectronic properties. In particular, perovskite NCs have remarkably high photoluminescence quantum yields in solution and as thin films and impressive open circuit voltages in photovoltaic devices.

Despite these promising results, little work has been done to understand the stability of CsPbI 3 NCs for optoelectronic device applications. It has been previously shown that the ligands impart tensile surface strain, which stabilizes the black three-dimensional 3D perovskite phase against phase degradation, making CsPbI 3 NCs some of the most structurally robust inorganic halide perovskites to date.

We demonstrate that the degradation mechanism of NCs is unique from, and 2 orders of magnitude slower than, their polycrystalline thin-film counterparts. This is mediated through reactions with superoxide and other reactive oxygen species, which are initiated from surface defect states, O 2 and light. We then use this mechanistic insight to identify multiple strategies to prolong the lifetimes of CsPbI 3 NC films, by going beyond surface strain to mitigate key surface chemistries.

We demonstrate that 1 minimizing the number of surface defects 2 using an alkylammonium bromide ligand surface treatment and 3 encapsulation with an oxygen scavenging layer all increase NC film lifetimes by inhibiting various steps in the photo-oxidation degradation reaction. Jennifer A. Her gQD design has been extended to multiple QD and other nanostructure systems, and several are being explored for applications from ultra-stable molecular probes for advanced single-particle tracking to solid-state lighting and single-photon generation.

A recent focus of her group is to advance scanning probe nanolithography for precision placement of single nanocrystals into metasurfaces and plasmonic antennas. Solution-processed quantum dots QDs are finding applications in a wide-range of technologies from displays and lighting to photovoltaics and photodetectors.

Advances in real-world technologies have been enabled by an increasing ability to fine-tune opto-electronic properties with strategies including quantum confinement effects, advanced heterostructuring band-structure engineering at the nanoscale , and chemical manipulation of interfaces and surfaces.

Taken together, these strategies have yielded numerous breakthroughs and insights into key fundamental excited-state processes in semiconductor nanocrystals. In our lab, we have focused on developing heterostructures that lead to suppression of non-radiative processes, including blinking, photobleaching, and Auger recombination.

We further determined that full-power LED-like excitation can add K of heat to the nanocrystals due to high excitation rates and associated nonradiative relaxation. The specific reactions that are responsible for photo-oxidative degradation in gQDs are as yet unknown.

However, at least one of the primary degradation reactions is now known to be a zero-order process with a reaction activation energy that is independent of photon flux or wavelength. David J. He received his B. In , he moved to his current position at ETH Zurich. The most studied class of semiconductor nanocrystal—quasi-spherical particles known as colloidal quantum dots—is now commercially used as a fluorescent material. However, despite decades of research, state-of-the-art samples still exhibit a distribution in size and shape, reducing their performance for applications.

This leads to a fundamental question: can we achieve true monodispersity in semiconductor nanocrystals via chemical synthesis? In this talk we will discuss this issue by examining two classes of nanomaterials. First, we will consider thin rectangular particles known as semiconductor nanoplatelets NPLs. Amazingly, NPL samples can be synthesized in which all crystallites have the same atomic-scale thickness e.

This uniformity in one dimension suggests that routes to monodisperse samples might exist. After describing the underlying growth mechanism for NPLs, we will then move to a much older nanomaterial—magic-sized clusters MSCs.

Such species are believed to be molecular-scale arrangements i. Their existence implies that MSC samples can in principle be monodisperse in size and shape. Unfortunately, despite three decades of research, the formation mechanism of MSCs remains unclear, especially considering recent experiments that track the evolution of MSCs to sizes well beyond the cluster regime.

Again, we will discuss the underlying growth mechanism and its implications for nanocrystal synthesis. His research involves studies of the motion of electrons in novel nanostructured materials that have potential applications in e.

Materials of interest include organic nanostructured materials, semiconductor quantum dots, nanorods and two-dimensional materials. Studies on charge and exciton dynamics are carried out using ultrafast time-resolved laser techniques and high-energy electron pulses in combination with quantum theoretical modeling.

Colloidal CdSe nanoplatelets NPLs can be made with a thickness of atomic precision in the range of about one to a few nanometers only. The lateral sizes are of the order of several to tens of nanometers. The thickness is less than the bulk exciton bohr radius and consequently leads to strong effects of spatial confinement on the internal energy of an exciton.

Variation of the thickness of a NPL thus allows one to tune the photoluminescence PL and optical absorption spectra. Interestingly, however, the experimental shape of PL and absorption spectra also depends on the lateral sizes of a NPL. To date, the latter has not received much attention, with the exception of a few mainly theoretical studies and the origin of this effect has been inconclusive. We measured the PL and absorption spectra for a series of NPLs with different lateral sizes and find that the dependence of the optical spectra on the lateral size is fully explained by taking into account the quantum-confinement effects on the translational motion of excitons in the plane of the NPLs.

The spectra of all samples considered can be reproduced very accurately by a theoretical description of exciton energies and oscillator strengths based on the quantum mechanical particle-in-a-box model and the known size-distribution of the NPLs. He did his PhD under supervision of Emmanuel Rosencher on the transport properties of superlattices used as infrared detector.

He then did post doc in the group of Guyot Sionnest and Dubertret, working on the optoelectronic properties of nanocrystals. His team is dedicated to optoelectronic of confined nanomaterials. Quantum confinement is certainly the most striking properties of nanocrystal at the nanoscale.

In CdSe this is used to tune the energy of the first exciton from green to red enabling their use as downconverter for display. In HgTe the lack of bulk band gap and the weak conduction effective mass makes that the absorption edge can be widely tuned from UV to THz [1]. As a result, the optical properties of the NPL also gets affected.

To understand this trend, we systematically explore the pressure 0. The model unveils the critical role plays by the upper conduction band in the curvature of the first conduction band in the strong confinement regime. These HgTe NPL are latter integrated into field effect transistors and photodetectors [] to reveal the nature of the majority carrier and their photoconductive properties in the near and short wave infrared. JACS , Layered semiconductors attract significant attention due to their diverse physical properties controlled by their composition and the number of stacked layers, but still obtaining material in large quantity may be a challenge.

Liquid exfoliated van der Waals semiconducting crystals have been recently described as the main active material in all-printed devices such as transistors or photodetectors. This technique may lower device preparation cost by accelerating production and omitting expensive methods like lithography.

Herein, large crystals of the ternary layered semiconductor - chromium thiophosphate CrPS 4 are prepared in big amounts by a vapor transport synthesis. Optical properties are determined using photoconduction, absorption, photoreflectance, and photoacoustic spectroscopy exposing the semiconducting properties of the material. CrPS 4 is also liquid exfoliated and then obtained suspension is converted into an ink. Finally, the CrPS 4 ink in combination with colloidal graphene is used for creating ink-jet printed photodetector.

The study shows a potential application of both bulk crystal as well as individual flakes of CrPS 4 as active components in light detection, when introduced as ink printable moieties with a large benefit for manufacturing. Directing the self-assembly of colloidal nanocrystals into ordered superstructures is of fundamental and technological interest for creating designer materials that bridge multiple length scales.

The assembly of polyhedral nanocrystals at the interface of two immiscible fluids presents a promising approach to create high-fidelity superlattices with exceptional translational order and enables control over the orientational order of constituent building blocks.

However, the full potential of this assembly approach remains elusive since despite the ostensible simplicity of the interfacial assembly, many knowledge gaps persist concerning the nuanced physicochemical phenomena that occur during assembly.

Using synchrotron-source grazing incidence small angle X-ray scattering GISAXS , the fluid and particle dynamics which lead to the final highly ordered superlattices can be elucidated. In this work, we used high time resolution GISAXS to characterize the spreading and drying dynamics of PbSe nanocrystals assembling from droplet contact with the liquid substrate to the final superlattice structure.

Additionally, we explain how tuning the solvent parameters, such as volatility, surface tension and polarity, determines the mesoscale morphology of 2D superlattices on ethylene glycol. Specifically, the solvent interaction with the liquid substrate and ligand shell dynamics during evaporation have significant effects on the final superlattice morphology.

Improved understanding of the kinetic phenomena giving rise to superlattice topology will enable growth of high-quality superlattices with long-range order at both nano- and micro- scales. There is an increasing interest in two-dimensional 2D Ruddlesden-Popper perovskites for solar harvesting and light emitting applications due to their superior chemical stability as compared to bulk perovskites.

Particularly, the reduced dimensionality in 2D perovskites results in excitonic excited states which dramatically modify the dynamics of charge collection. While the carrier dynamics in bulk systems is increasingly well understood, a detailed understanding about the spatial dynamics of the excitons in 2D perovskites is lacking. Here, we present the direct measurement of the intrinsic diffusivities and diffusion lengths of excitons in single crystalline 2D perovskites using time-resolved microscopy.

Our technique allows us to follow the temporal evolution of a diffraction limited exciton population with sub-nanosecond resolution revealing the spatial and temporal exciton dynamics. We reveal two distinct temporal regimes: For early times excitons undergo unobstructed normal diffusion, while at later times exciton transport becomes subdiffusive as excitons get trapped.

We find that changes in these parameters can yield diffusivities which differ in up to one order of magnitude. We show that these changes arise due to strong exciton-phonon interactions and potentially with the formation of large exciton-polarons.

Our results provide insight into how excitons diffuse through 2D perovskites and yield clear design parameters for more efficient 2D perovskite solar cells and light emitting devices. Silver phenylselenolate AgSePh is an emerging excitonic two-dimensional semiconducting member of a hybrid metal-organic chalcogenolate family. In addition to its two-dimensional structure with high exciton binding energy, strong in-plane anisotropy, and a narrow emission spectrum at nm, AgSePh does not contain any toxic element and is tolerant to both polar and non-polar solvents.

AgSePh can be synthesized by a solution-phase reaction as well as a scalable vapor-phase method. Here, we show by testing 24 solvents — with different polarities, boiling points and functional groups — that complexation between silver cations and solvent molecules is the key to an increasing size of AgSePh crystals. The improved syntheses reported in this work will allow easy integrations of AgSePh in both thin-film electronic and nanoelectronic applications as well as the exploration of strong excitonic anisotropy.

Abstract: Biexcitons in 2D transition metal dichalcogenide from first principle: binding energies and fine structure. The emerging field of 2-dimensional 2D materials keeps gaining increasing attention due to the wide range of potential applications in many domains including: optoelectronics, photovoltaic, sensing, quantum computing Reducing the dimensionality of a system results in an enhancement of the Coulomb interaction between elementary quasiparticles i.

This allows for the formation of strongly bounded excitations which can be observed even at room temperature. Among these excitations, biexcitons are of special interest from both the experimental and theoretical perspectives due to its rich physics and potential applications in quantum information and lasing [1].

Understanding biexcitons would be the first step toward a clear understanding of the equilibrium dynamics of photo excited hot carriers and is also relevant in the context of exciton condensation. Moreover, the biexciton, being a complex bound state of 2 electrons and 2 holes, has a rich fine structure and many more degrees of freedom than the simple excitonic case. First principle treatment of biexcitons, on the same theoretical footing as excitons and trions, is possible thanks to the newly developed methodology of Ref.

This methodology has been shown to give reliable results on excitons and trions [2] and it is applied here to study the binding, fine structure and non-equilibrium effects of biexcitons in 2D transition metal dichalcogenide.

In recent year, in response to the request for flexible and sustainable energy storage devices with high electrochemical performance, there has been growing interest in using paper or paper-like substrates for batteries and other energy storage devices such as environmentally friendly supercapacitors [1]. In this context, cellulose-based substrates for energy storage devices could be well-engineered, are light-weight, safe, thin and flexible[2].

We demonstrated a scalable, low cost and easy-to-process approach for the preparation of energy storage devices using large area techniques like spray and blade coating, suitable for smart electronic applications for health monitoring. Following a green strategy, all components were formulated in water-based dispersions. Symmetric paper-based supercapacitors using common copy paper and electronic paper as substrate, and Poly 3,4-ethylenedioxythiophene -poly styrenesulfonate PEDOT:PSS as electrodes, are realized and investigated.

The novelty of this work consists in the use of composite based on detonation nanodiamonds DNDs and hydroxypropyl cellulose HPC as solid state electrolyte and separator. Nanostructures on the base of lead, tin and copper chalcogenides with defined shape, dimensionality, faceting and surface chemistry are promising building blocks for opto-electronic devices in the near-infrared spectral range. A high degree of control has been already reached within main approaches for the dimensionality control: anisotropic growth, mesophase confined growth due to templating effect and oriented attachment.

Here, we demonstrate several examples of fine-tuning of the shape and faceting of CuS, SnS and PbS quasi-two-dimensional structures with impact on electrical and optical properties. We also show synthetic details of the shape transformations combined with simulations which shed light onto the mechanism of the reached control.

In case of PbS nanostripes and nanowires we show how the faceting of a nanocrystal dramatically changes its properties from semiconducting to metallic ones and analyze the reasons of the observed behavior. Ramin Moayed, M. Advanced Functional Materials, 30 19 , Li, F. Colloidal tin sulfide nanosheets: formation mechanism, ligand-mediated shape tuning and photo-detection.

Journal of Materials Chemistry C, 6 35 , In-plane anisotropic faceting of ultralarge and thin single-crystalline colloidal SnS nanosheets. The journal of physical chemistry letters, 10 5 , Lesyuk, R. Copper sulfide nanosheets with shape-tunable plasmonic properties in the NIR region.

Nanoscale, 10 44 , The released monomers then recrystallized on the large top and bottom facets leading to a growth of NPLs in the thickness. A direct growth is also achieved when a chalcogenide precursor is jointly introduced with a metal halide. Finally when an incomplete layer is grown, homostructures with a type I band alignement are obtained thus offering a new degree of liberty for the synthesis of structured NPLs.

Two-dimensional 2D colloidal nanoplatelets NPLs are an emerging class of quantum well materials that exhibit many unique properties, including uniform quantum confinement, narrow thickness distribution, large exciton binding energy, giant oscillator strength effect, long Auger lifetime, and high photoluminescence quantum yield. These properties have led to great potentials in optoelectrical applications, such as lasing materials with a low threshold and large gain coefficient.

Many of these properties are determined by the structure and dynamics of band-edge excitons in these 2D materials. Motivated by both fundamental understanding and potential applications, the properties of 2D excitons have received intense recent interests. We have carried out a series of recent studies on fundamental exciton properties in 2D NPLs, including lateral size the 2D exciton i. In this talk I will focus on the size, thickness and material dependence of bi-exciton Auger recombination rates.

Instead, the Auger lifetime scales linearly with the lateral size, and the Auger lifetime depends sensitively nonlinearly on the NPL thickness. These observations can be explained by a model in which the Auger recombination rate for 1D nanorods NRs and 2D NPLs is a product of binary collision frequency in the non-quantum confined dimension, and Auger probability per collision. The Auger recombination proability per collision depends on material property and the degree of quantum confinement, which gives rise to nonlinear dependence on the thickness of NPLs and diameter of NRs, as well as material dependence of Auger lifetimes.

Thus, the Auger lifetimes of 2D NPLs and 1D nanorods deviate from the volume scaling law because of the different dependences on the quantum confined and non-confined dimensions. We believe that his model is generally applicable to all 1D and 2D materials. Two-dimensional 2D semiconductors are of a wide interest in recent years due to their unprecedented electrical and optical characteristics.

The 2D endeavor, beyond the discovery of graphene, includes the study of inorganic van der Waals vdW transition metal dichalcogenides and solution based-2D semiconductors. Despite the striking electronic and optical properties of the mentioned 2D materials, those are lacking long-range magnetic properties or unique magnetic textures. The current study describes the exploration of a new family of semiconductor vdW compounds that possess magnetism along with their electrical and optical properties — these compounds are transition metal phosphorous trichalcogenides TMPTs with a honeycomb arrangement of magnetic metal elements.

Furthermore, diamagnetic TMPTs doped with magnetic impurities will be addressed - in comparison with diluted magnetic colloidal nanoplatelets from the II-VI family. These vdW materials permit the isolation of single layers down to a molecular limit via chemical or mechanical exfoliation.

The 2D limit ease the Mermin-Wagner thermal agitation restriction and therefore, support intrinsic protected long-range ferromagnetic FM or antiferromagnetic AFM order, as well as spin textures e. The honeycomb arrangement renders some of the TMPTs with a valley degree of freedom, similar to that found in MoS 2 single layers. The properties were investigated using circularly polarized magneto-photoluminescence at variable temperatures and optically detected magnetic resonance spectroscopy.

The preliminary observations indicated a removal of valleys' energy degeneracy by the coupling to the AFM magnetic arrangement. Furthermore, Mn-doped diamagnetic TMPT showed a coupling between dopant and photo-generated carriers with a behavior similar to exciton-polaron found in doped colloidal II-VI nanoplatelets. Overall, the TMPT and magnetically doped 2D materials open a new paradigm in science and technology, from the basic understanding of magnetism, to the discovery of a plethora of new physical phenomena, thus being a base for the development of modern memory devices, spintronics, quantum computation and information.

Colloidal nanoplatelets NPLs have become a promising class of semiconductor nanocrystals NCs for optoelectronic applications with their distinctly different optical characteristics [1]. They exhibit narrow emission linewidth, large absorption cross-section, giant oscillator strength, and suppressed Auger recombination. Here, to overcome this issue, we demonstrate a high-temperature shell growth approach that enables the synthesis of NPLs with controlled shell composition [2].

We also investigated the electroluminescent performance of graded shell NPLs in solution-processed light-emitting diodes LEDs. These findings show that by carefully designing heterostructures of anisotropically shaped colloidal NPLs, we could obtain highly efficient NPLs with enhanced optical properties to realize their superior performance in optoelectronic applications, overcoming the limitations of the spherically shaped NCs. Colloidal nanocrystal superlattices are highly ordered aggregates of particles.

Crystals are highly ordered aggregates of atoms. However, nanocrystal superlattices are not conventionally considered crystals. But where does the border lie? Previously, we reported that CsPbBr 3 nanocrystal superlattices have a structural perfection comparable with that of epitaxially grown multilayers, which can be considered as full-fledged single-crystals.

In this talk, we will discuss a novel approach to the characterization of periodically stacked colloidal nanocrystals, which was inspired by diffraction experiments on multilayers grown by molecular beam epitaxy. By fitting these profiles, collected with a common lab-grade diffractometer, we can extract structural information usually requiring high-end setups such as synchrotrons.

Our approach is especially suitable for bidimensional colloidal crystals like nanoplatelets and nanosheets, because they spontaneously assemble into stacked periodic structures thanks to their highly anisotropic shape. However, we expect that our approach can be also extended 2D-layered organic-inorganic materials, which are not considered superlattices but share with them the periodic alternation of different layers.

To demonstrate our approach, we analyzed nanoplatelets of CsPbBr 3 and PbS measuring with high precision thickness, interparticle distance and even distortions in their atomic lattice. In addition, we demonstrated that such nanocrystal superlattices reach stacking displacements as small as 0. This is comparable with atomic displacement parameters found in metal-organic bulk crystals, leading to intriguing questions.

For example, how different is a stacking of perovskite nanoplatelets from a bulk crystal of a hybrid Ruddlesden-Popper perovskite? Can we study nanocrystal superlattices as they were bulk crystals? In the end, are nanocrystal superlattices a new class of hybrid organic-inorganic bulk crystals? Colloidal semiconductor nanoplatelets NPLs exhibit strong quantum confinement only along the vertical direction, which can be controlled with atomic precision, and have received significant attention because of their narrow emission spectra and fast fluorescence lifetimes.

Here we present a synthetic approach to obtain a ternary two dimensional 2D architecture consisting of a CdSe core, laterally encapsulated by a type-I barrier of CdS, and finally a type-II outer layer of CdTe. The introduction of CdS leads to the formation of a tunneling barrier between CdSe and CdTe, which modulates the electron-hole overlap as well as the carrier relaxation dynamics. The modulation results in a type-II emission with an extended fluorescence lifetime in addition to the emission from CdSe and CdTe.

The synthesis strategies allowed us to tune the indirect and direct transition energies and intensities as a function of the barrier and crown thickness. Shakeup processes are partly radiative Auger processes whereby an electron-hole pair recombines but transfers a fraction of its energy to excite a third carrier, thus reducing the energy of emitted photons.

Our work provides the first theoretical description on the origin and behavior of shakeup processes in colloidal nanostructures, defines strategies to control them and assesses on the interpretation of Ref. The conclusions are:. The magnitude of the shakeup lines is strikingly large -over one order of magnitude larger than in epitaxial quantum wells-. The optical absorptance A of a semiconductor layer is the ratio between the absorbed and incident energy. It was shown experimentally that, after corrections due to local-field effects, the absorptance of thin InAs layers is characterized by very clear steps corresponding to nA 0 , where n is an integer and A 0 is the product of pi and the fine structure constant [1].

Remarkably, the quantum of absorptance was originally found for graphene monolayers, in a wide energy region [2]. In both cases, the explanation of this observation was provided on the basis of simplified calculations applied to a two-band model. In order to go beyond these approximations, we present atomistic multi-band tight-binding calculations of the absorptance of different types of semiconductor layers.

We confirm that, in absence of strong excitonic effects, A is characterized by clear steps which can be related to A 0. The cases of layers of InAs and PbSe are studied in detail, taking into account the complex band structure of these materials. In the case of InAs, remarkable agreement with experiments is found. The origin of the quantization is discussed. Salahub and Exeter Patrick Fowler.

His research interests include molecular framework compounds, two-dimensional materials, theoretical spectroscopy, and the development of methods and software for materials science. In this talk I will present two routes to computationally develop new photocatalysts. In the first one, layered noble metal chalconides and pnictonides [1], which show potential to be photocatalytically active, are exfoliated, and the resulting layers are investigated with respect to their properties, most importantly their stability and performance to photo catalyze hydrogen and oxygen evolution reactions in dependence on the pH and other factors.

We have successfully applied this strategy recently to a series of noble-metal chalcogenides [2], phosphochalcogenides [3,4] and pnictonides [5]. In the second route, photoactive molecules, for example phorphyrin derivatives [6], are incorporated into synthetic framework materials such as metal-organic frameworks MOFs [7], where stacking provides additional band dispersion and supports charge carrier separation [8].

A similar approach is possible for covalent-organic frameworks COFs [9]. Alexander W. His research concentrates on the linear and nonlinear optical as well as electronic properties of 2D semiconductors, with a focus on II-VI nanosheets and transition metal dichalcogenides. We present combined experimental and theoretical studies [], demonstrating that CdSe nanoplatelets are a model system to investigate the tunability of trions and excitons in laterally finite 2D semiconductors.

Our results show that the trion binding energy can be tuned from 36 meV to 18 meV with lateral size and decreasing aspect ratio, while the oscillator strength ratio of trion to exciton decreases. The trion and exciton Bohr radii become lateral size tunable, e. This lateral tunability is practically independent of the transition energy, which is determined by the strong z-confinement in the colloidal wells.

We show that dielectric screening has strong impact on these properties. By theoretical modeling of transition energies, binding energies and oscillator strength of trion and exciton and comparison to experimental findings we demonstrate that these properties are lateral size and aspect ratio tunable and can be engineered by the dielectric confinement. The trion binding energy can be tuned below or above the room temperature thermal energy.

This allows e. We further show that e. The exciton mobility and diffusion coefficient become size and additionally lateral aspect ratio tunable. Our results strongly impact further studies, as the demonstrated lateral size and aspect ratio tunable trion and exciton manifold is expected to influence properties like gain mechanisms, lasing, exciton-phonon interaction and transport at low temperature, but also even at room temperature due to the high and tunable exciton and trion binding energies.

I obtained my PhD degree in applied physics at Ghent University in , studying near-infrared lead salt quantum dots. This was followed by a postdoc on quantum dot emission dynamics at Ghent University in collaboration with the IBM Zurich research lab. The research in our group ranges from the synthesis of novel fluorescent nanocrystals to optical spectroscopy and photonic applications. Two-dimensional fluorescent colloidal nanocrystals combine the flexibility of solution-processed nanomaterials with the advantages of a quasi- 2D band structure that offers enhanced optical properties compared to 0D quantum dots.

In this presentation, I will discuss the synthesis of a novel ternary heterostructure, composed of a CdSe core, laterally extended by a CdS tunneling barrier, and finally a CdTe crown. Colloidal 2D nanosheets and nanoplatelets with thickness- and dimensionality-dependent properties are highly interesting for innovative optoelectronics in the visible and near-infrared.

The first part of my talk is focused on our work in tailoring the synthesis and optoelectronic properties of ultrathin lead chalcogenide nanoplatelets NPLs. In the second part of my talk, I will focus on our progress in controlling the formation of ultrathin metallic and semiconducting transition metal dichalcogenide layers by wet-chemical methods. Our work emphasizes the excellent usability of colloidal chemistry and time-resolved spectroscopy methods for producing tailor-made 2D materials.

Failla, E. Klein, C. Klinke, S. Kinge, L. He obtained his B. He worked at the University of Chicago as a JFI post-doctoral scholar from to before joining the chemistry department at Korea University. His research focuses on the infrared colloidal nanocrystals. Visit Michele Flory at www. If you enjoyed this post, please consider sharing it with others. Home Real Estate Blog Details. Remove All. Share Selected Compare Map Selected.

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