A5077507929- solar cell performance optimization
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Silicon and Solar Cell Technologies
- Photovoltaic Systems and Sustainability
- Nanowire Synthesis and Applications
- Photovoltaic System Optimization Techniques
- TiO2 Photocatalysis and Solar Cells
- Semiconductor Quantum Structures and Devices
- Quantum Dots Synthesis And Properties
- Technology Assessment and Management
- Solid-state spectroscopy and crystallography
- Electronic and Structural Properties of Oxides
- Spacecraft Design and Technology
- Advanced Semiconductor Detectors and Materials
- Advanced Surface Polishing Techniques
- Magnetic and transport properties of perovskites and related materials
- Thin-Film Transistor Technologies
- Global Energy and Sustainability Research
- Advanced battery technologies research
- Crystal Structures and Properties
- Silicone and Siloxane Chemistry
- Organic Electronics and Photovoltaics
- Innovation Policy and R&D
- Advancements in Semiconductor Devices and Circuit Design
Glenn Research Center
2021-2024
National Renewable Energy Laboratory
2014-2024
Case Western Reserve University
2024
Colorado School of Mines
2016-2023
Wilberforce University
2023
University of California, Merced
2023
National Aeronautics and Space Administration
2023
California Institute of Technology
2022
University of Colorado Boulder
2022
SLAC National Accelerator Laboratory
2022
Abstract Published data on photovoltaic (PV) degradation measurements were aggregated and re‐examined. The subject has seen an increased interest in recent years resulting more than 11 000 rates almost 200 studies from 40 different countries. As have grown number size, we found impact sampling bias attributable to size accuracy. Because of the correlational nature this study examined several ways minimize bias. We median for x‐Si technologies 0.5–0.6%/year range with mean 0.8–0.9%/year...
Abstract The extensive photovoltaic field reliability literature was analyzed and reviewed. Future work is prioritized based upon information assembled from recent installations, inconsistencies in degradation mode identification are discussed to help guide future publication on this subject. Reported failure rates of modules fall mostly the range other consumer products; however, long expected useful life may not allow for direct comparison. In general, percentages reported decrease...
Abstract Perovskite photovoltaics have been shown to recover, or heal, after radiation damage. Here, we deconvolve the effects of based on different energy loss mechanisms from incident protons which induce defects can promote efficiency recovery. We design a dual dose experiment first exposing devices low-energy efficient in creating atomic displacements. Devices are then irradiated with high-energy that interact differently. Correlated modeling, (with increased ionizing component)...
Abstract The high cost of wafers suitable for epitaxial deposition III‐V solar cells has been a primary barrier to widespread use these in low‐concentration and one‐sun terrestrial applications. A possible solution is reuse the substrate many times, thus spreading its across cells. We performed bottom‐up techno‐economic analysis three different strategies high‐volume manufacturing: lift‐off, spalling, porous germanium release layer. shows that potential reduction resulting from limited all...
Abstract Metal halide perovskites (MHPs) have emerged as a prominent new photovoltaic material combining very competitive power conversion efficiency that rivals crystalline silicon with the added benefits of tunable properties for multijunction devices fabricated from solution which can yield high specific power. Perovskites also demonstrated some lowest temperature coefficients and highest defect tolerance, make them excellent candidates aerospace applications. However, MHPs must...
Tandem and multijunction solar cells offer the only demonstrated path to terrestrial 1-sun cell efficiency over 30%. Three-terminal tandem (3TT) can overcome some of limitations two-terminal four-terminal designs. However, coupled nature adds a degree complexity devices themselves ways that their performance be measured reported. While many different configurations 3TT have been proposed, there is no standard taxonomy discuss device structure or loading topology. This Perspective proposes...
Perovskite quantum dots (PQDs) have many properties that make them attractive for optoelectronic applications, including expanded compositional tunability and crystallographic stabilization. While they not achieved the same photovoltaic (PV) efficiencies of top-performing perovskite thin films, do reproducibly show high open circuit voltage (VOC) in comparison. Further understanding VOC attainable PQDs as a function surface passivation, contact layers, PQD composition will further progress...
A progression of potential-induced degradation (PID) mechanisms is observed in CdTe modules, which are dependent on the stress level and moisture ingress. This includes shunting, junction degradation, two different manifestations series resistance. The dark <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I–V</i> method for xmlns:xlink="http://www.w3.org/1999/xlink">in situ</i> characterization xmlns:xlink="http://www.w3.org/1999/xlink">P</i>...
Perovskite solar cells (PSCs) could provide new low-cost opportunities for powering spacecraft. We are designing a PSC resilient to lunar surface conditions, focusing on contact/barrier layers combinations that maximize stability. Thermal vacuum stress shows with gold back-contacts and SiOx protection retain >90% of initial efficiency indium tin oxide (ITO)-contacted ∼100% after five months stress. mitigates mechanical aspects contact stress, retaining 99% efficiency, whereas silicone/cover...
Mechanically stacked III–V-on-Si (III–V//Si) tandem solar cells have demonstrated efficiencies beyond what can theoretically be achieved by single junction Si cells, but III–V costs are currently at least an order of magnitude higher than costs. Recent techno-economic analysis shows that could substantially reduced replacing traditional metalorganic vapor phase epitaxy (MOVPE) with a lower-cost deposition technique, such as hydride (HVPE). This study analyzes the performance HVPE-grown GaAs...
High-efficiency, four-terminal tandem solar cells composed of thin GaAs films mechanically stacked onto interdigitated back contact silicon with a glass interlayer are demonstrated. The optimal thickness the absorber layer rear heterojunction subcell for use in four terminal was studied. top thicknesses 1.5, 1.9, 2.3, 2.8, and 3.5 μm were fabricated on back-contact Si bottom cells. All found to have efficiencies above 30% under AM1.5 G spectrum demonstrating relatively weak sensitivity...
Abstract We report first results on a new solar cell structure which incorporates n‐type ZnO nanowires, an undoped CdSe layer, obtained from quantum dot precursors, and p‐type polymer layer as the main components. In fabrication process is converted to conformal ∼30 nm thick polycrystalline film. The of occurs in lab air at temperatures below 100 °C. Several intermittent annealing steps raise energy conversion efficiency approximately 1%. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The properties of the multilayer PV backsheets, including their interfaces, during weathering are not well-known. In this study, a commercial PPE (polyethylene terephthalate (PET)/PET/ethylene vinyl acetate (EVA)) backsheet films was selected as model system for depth profiling study chemical and mechanical film UV exposure. Cryo-microtomy used to obtain cross-sectional samples. NIST SPHERE (Simulated Photodegradation via High Energy Radiant Exposure) accelerated laboratory exposure...
Aerospace In article number 2203920, Lyndsey McMillon-Brown, Sayanatani Ghosh, and co-workers report on the first long duration space flight of a metal halide perovskite photoactive layer International Space Station. Post-flight analysis reveals that samples exhibit superior photo-stability, no irreversible radiation damage, suppressed structural phase transition temperature, broadening photovoltaic operational range. These results confirm photovoltaics can be designed to endure environment.
Perovskite Photovoltaics In article number 2300468, McMillon-Brown and co-workers analyzed the thermal performance of perovskite photovoltaics operating in low earth orbit. A backside layer 1 μm silicon oxide 500 nm zirconia is determined to be optimal for management. Residual stresses operational cycles failure are quantified. Target power conversion efficiencies presented reduce maximum temperature a photovoltaic space.
In support of a sustainable human-lunar presence, there is need for very large (>100kW) and high-voltage-capable solar arrays, estimated to cost over $150M. Perovskite-based thin film photovoltaics offer substantial advantages state the art arrays from perspective manufacturing arrays. Many challenges perovskite cells experience in terrestrial operations, e.g degradation caused by moisture oxygen exposure, are not applicable long-term space applications. The must present thermal vacuum...