A5079320319- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Microbial Fuel Cells and Bioremediation
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Microbial Community Ecology and Physiology
- Photosynthetic Processes and Mechanisms
- Electrochemical Analysis and Applications
- Transition Metal Oxide Nanomaterials
- Advanced Memory and Neural Computing
- Optical properties and cooling technologies in crystalline materials
- Protist diversity and phylogeny
- Photochromic and Fluorescence Chemistry
- Electrowetting and Microfluidic Technologies
- Gas Sensing Nanomaterials and Sensors
- TiO2 Photocatalysis and Solar Cells
Cornell University
2022-2025
The University of Texas at Austin
2018-2022
National Renewable Energy Laboratory
2019
The ability to manipulate quantum dot (QD) surfaces is foundational their technological deployment. Surface manipulation of metal halide perovskite (MHP) QDs has proven particularly challenging in comparison that more established inorganic materials due dynamic surface species and low material formation energy; most conventional methods chemical targeted at the MHP QD will result transformation or dissolution crystal. In previous work, we have demonstrated record-efficiency solar cells...
We report a detailed study on APbX3 (A = formamidinium (FA+), Cs+; X I–, Br–) perovskite quantum dots (PQDs) with combined A- and X-site alloying that exhibits both wide bandgap high open-circuit voltage (Voc) for the application of potential top cell in tandem junction photovoltaic (PV) devices. The nanocrystal affords control over optical is readily achieved by solution-phase cation anion exchange between previously synthesized FAPbI3 CsPbBr3 PQDs. Increasing only Br– content PQDs widens...
Integrating the optoelectronic properties of quantum dots (QDs) with biological enzymatic systems to form microbe-semiconductor biohybrids offers promising prospects for both solar-to-chemical conversion and light-modulated biochemical processes. Developing these nano–bio hybrid necessitates a deep understanding charge-transfer dynamics at interface. Photoexcited carrier transfer from QDs microbes is driven by complex interactions, emerging insights into relevant thermodynamic kinetic...
Light-induced changes in photophysical and electronic properties metal halide perovskites can affect their performance photovoltaic devices, light-emitting diodes, other applications. Here we reveal that light induces a slow, reversible enhancement photoluminescence (PL) lifetime intensity films of perovskite-phase CsPbI3 nanocrystals. When nanocrystals stored air are photoexcited, PL increase by as much factor 5 over the course 20–30 min. Several hours later, without additional excitation,...
Color-changing materials have a variety of applications, ranging from smart windows to sensors. Here, we report deliquescent chromism thin, color neutral films nickel(II) iodide (NiI2) that are less than 10 μm thick. This behavior does not occur in the bulk material. Dark brown thin crystalline NiI2 turn clear when exposed humidity and can be switched back dark state mildly heated (>35 °C). optical transition between states an film is reversible with thermal cycling.
Photosynthetic semiconductor biohybrids (PSBs) convert light energy to chemical through photo-driven charge transfer from nanocrystals microorganisms that perform bioreactions of interest. Initial proof-of-concept PSB studies with an emphasis on enhanced CO2 conversion have been encouraging; however, bringing the broad prospects PSBs fruition is contingent establishing a firm fundamental understanding underlying interfacial processes. We introduce bioelectronic platform reduces complexity by...
Abstract There are only a few examples of nanocrystal synthesis with thallium (Tl). Here, we report the uniform, ligand‐stabilized colloidal nanocrystals TlBr and Tl 2 AgBr 3 average diameter ranging between 10 20 nm. made by hot injection trimethylsilyl bromide (TMSBr) into solutions oleylamine, oleic acid octadecene (III) or (I) acetate. form when silver acetate is included in reaction. The have CsCl crystal structure direct band gap 3.1 eV. trigonal dolomite an indirect were sufficiently...