A5091470699- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Advanced Semiconductor Detectors and Materials
- Semiconductor materials and interfaces
- Perovskite Materials and Applications
- Silicon and Solar Cell Technologies
- Luminescence Properties of Advanced Materials
- Copper-based nanomaterials and applications
- Organic Electronics and Photovoltaics
- Photovoltaic System Optimization Techniques
- Carbon Nanotubes in Composites
- Solid State Laser Technologies
- nanoparticles nucleation surface interactions
- Semiconductor Quantum Structures and Devices
- Graphene research and applications
- Thermal properties of materials
- Solid-state spectroscopy and crystallography
- Machine Learning in Materials Science
- Lanthanide and Transition Metal Complexes
- Crystal Structures and Properties
- Electronic and Structural Properties of Oxides
- Fullerene Chemistry and Applications
- Luminescence and Fluorescent Materials
- Photorefractive and Nonlinear Optics
- Advancements in Semiconductor Devices and Circuit Design
First Solar (United States)
2016-2024
Walsh University
2023
Khalifa University of Science and Technology
2022
Bowling Green State University
2022
National Renewable Energy Laboratory
2022
Perry Point VA Medical Center
2017
Kintech Lab (Russia)
2011-2017
Lomonosov Moscow State University
2007-2009
Cadmium telluride (CdTe)-based cells have emerged as the leading commercialized thin film photovoltaic technology and has intrinsically better temperature coefficients, energy yield, degradation rates than Si technologies. More 30 GW peak (GWp) of CdTe-based modules are installed worldwide, multiple companies in production, shipping at up to 18.6% efficiency, lab cell efficiency is above 22%. We review developments science that occurred over approximately past decade. These achievements were...
Current research on graphene, a 2D hexagonal structure of carbon atoms, is presented. The structural features and basic methods for obtaining graphene are discussed. phononic properties their dependent characteristics examined. In particular, how to measure the thermal conductivity discussed recent experimental theoretical advances this subject described. stability problems crystal structures addressed dimensional effects in dependence lateral size Simulation determining reviewed.
Association of crystalline point defects in chlorinated Cu-doped CdTe PV absorbers studied to assess its impact on performance and stability.
There is widespread interest in reaching the practical efficiency of cadmium telluride (CdTe) thin-film solar cells, which suffer from open-circuit voltage loss due to high surface recombination velocity and Schottky barrier at back contact. Here, we focus on contacts superstrate configuration with goal finding new materials that can provide improved passivation, electron reflection, hole transport properties compared commonly used material, ZnTe. We performed a computational search among...
Low operational stability is the main limiting factor for commercialization of blue phosphorescent organic light emitting diodes (PhOLEDs). The high energy and long lifetime triplet excitons in PhOLEDs makes them more prone to degradation. Degradation host molecules layer one possible mechanisms leading luminosity loss course device operation. Although degradation are proposed literature, predicting kinetics not straightforward because evolution excited states should be accurately described....
To overcome the limitations of thermodynamic defect models, we introduce a multilevel kinetic approach to simulate activation $p$ doping in CdTe by group V elements using arsenic as ``model'' dopant. On lowest level, calculate and parameters point defects, complexes, reactions from first principles. intermediate use these rates reactions. Finally, time evolution defects free carriers. Our results show importance factors chemistry models. We reveal primary pathway be fast reaction which...
We present an analysis of recombination activity intrinsic defects (VCd, TeCd, VTe, and Tei) in CdTe based on the multiphonon single-mode carrier-capture model, with vibronic parameters obtained using hybrid density functional theory. This allows us to determine corresponding electronic processes that have high trapping rates for electrons, holes, or both. The latter, being potentially most active centers, decreases carrier lifetime absorber layer a solar cell. Taking into account relatively...
This paper reports on 1D kinetic modeling of p‐type doping formation in Cu‐doped chlorinated CdSeTe photovoltaic (PV) absorbers with graded Se profiles. Following the recent progress simulations defect chemistry stoichiometric CdTe films, this work extends simulation capabilities to a domain semiconductor alloy films stoichiometries. The energies and ionization levels, as well diffusion reaction barriers used reaction‐diffusion equations are calculated from first principles. A new formalism...
It is usually assumed that deep defect levels are responsible for the high resistivity in detector-grade CdTe, however, it has been recently reported shallow defects alone can explain resistivity. In order to resolve this contradiction we analyze different high-temperature compensation regimes and particularly show donor–acceptor self-compensation not a sufficient condition We also dependence of Fermi level on donor concentration at both temperature room using analytical solution charge...
Abstract The efficiency potential for single‐junction photovoltaics (PV) is described by the detailed balance model, which requires elimination of nonradiative recombination and perfect minority carrier collection. Improvements in GaAs, Si, perovskite PV follow this model. It might be more complex CdTe, a leading thin‐film technology. While lifetime, passivation, doping goals 25% efficient CdTe solar cells are largely reached, voltage ≈20% below limit. Why that? In Se‐alloyed CdSe x Te 1‐x...
Absorber material with high and stable p-type doping that does not impede free carrier lifetime is the key component enabling efficiency stability improvements in thin-film CdTe technology. To better understand compensation mechanism metastable effects related to Cu acceptors, most common dopant CdTe, i.e., a detailed kinetic model describing behavior of intrinsic Cu-related defects this material, has been developed applied for first time. Migration reactions these point single crystal have...
Time-resolved photoluminescence (TRPL) is widely used to measure carrier lifetime in thin-film solar cell absorbers. However, the injection dependence of data and frequent non-exponential decay shapes complicate interpretation. Here, we develop a numerical model simulate injection-dependent TRPL measurements SnO2/CdSeyTe1−y structure, considering parameters interest researchers industry academia. Previous simulations have shown that low injection, excess electrons holes injected by laser...
Using experiments and theory, we analyze "carrier-lifetime-killer" semiconductor bulk defects in CdTe. We can estimate the concentration of tellurium antisite (TeCd) recombination centers undoped CdTe from kinetic modeling injection-dependent photoluminescence (PL) lifetimes. For Cd-rich stoichiometry, lifetime-limiting [TeCd] is ≥10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">13</sup> cm xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> ....
In this article, we present a simulator for modeling transport of charge carriers and electrically active defect centers in solar cells by treating them on an equal footing, which allows us to address metastability reliability issues. The exact nonlinear differential equations set solved our solver is presented. formulation such equations, namely the continuity drift-diffusion equation, Poisson studying explained. parameters needed forming are taken from first principle calculations....
Advancing optoelectronic and emerging technologies increasingly requires control design of interfaces between dissimilar materials. However, incommensurate are notoriously defective rarely benefit from first-principles predictions, because no explicit atomic-structure models exist. Here, we adopt a bulk crystal structure prediction method to the interface geometry apply it SnO2/CdTe heterojunctions without with addition CdCl2, ubiquitous beneficial, but abstruse processing step in CdTe...
The results of the theoretical investigation Yb charge transfer luminescence (CTL) in sesqiuoxide matrices involving ab initio cluster calculations are presented this paper. Different parameters such as Stokes shift, excitation and emission wavelengths, bandwidths radiative lifetimes derived from compared with spectroscopic measurements. best agreement between calculated measured is obtained for case hole localized on a single oxygen ion first coordination sphere.
In this work, both experiments and simulations were employed to study Cu ion's role in light soaking effect of CdTe solar cells. Both experiment simulation show migration under forward-bias could cause device performance enhancement. As consistent results are achieved from aspects, we conclude that ions or other charged species be the enhancement observed experiments.
There is widespread interest in reaching the practical efficiency of cadmium telluride (CdTe) thin-film solar cells, which suffer from significant open-circuit voltage loss due to high surface recombination velocity and Schottky barrier at back contact. Here, we focus on contacts superstrate configuration with goal finding new materials, that can provide improved passivation, electron reflection hole transport properties compared commonly used material, ZnTe. We performed a computational...