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3 October 2022 Nonlinear effects in modeling thin-film graded-bandgap solar cells
Faiz Ahmad, Benjamin J. Civiletti, Akhlesh Lakhtakia, Peter B. Monk
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Proceedings Volume 12196, Active Photonic Platforms 2022; 121960D (2022) https://doi.org/10.1117/12.2632264
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
We model the effect of concentrated sunlight on CIGS thin-film graded-bandgap solar cells using an optoelectronic numerical model. For this purpose it is necessary first to solve the time-harmonic Maxwell equations to compute the electric field in the device due to sunlight and so obtain the electron-hole-pair generation rate. The generation rate is then used as input to a drift-diffusion model governing the flow of electrons and holes in the semiconductor components that predicts the current generated. The optical submodel is linear; however, the electrical submodel is nonlinear. Because the Shockley-Read-Hall contribution to the electron-hole recombination rate increases almost linearly at high electron/hole densities, the efficiency of the solar cell can improve with sunlight concentration. This is illustrated via a numerical study.
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Faiz Ahmad, Benjamin J. Civiletti, Akhlesh Lakhtakia, and Peter B. Monk "Nonlinear effects in modeling thin-film graded-bandgap solar cells", Proc. SPIE 12196, Active Photonic Platforms 2022, 121960D (3 October 2022); https://doi.org/10.1117/12.2632264
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KEYWORDS
Sun
Copper indium gallium selenide
Thin film solar cells
Optoelectronics
Semiconductors
Mathematical modeling
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