薄膜梯度带隙太阳能电池模型中的非线性效应

Faiz Ahmad, B. Civiletti, A. Lakhtakia, P. Monk
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摘要

本文利用光电数值模型模拟了集中太阳光对CIGS薄膜梯度带隙太阳能电池的影响。为此,首先需要求解时谐麦克斯韦方程,计算器件中由于阳光作用而产生的电场,从而得到电子-空穴对的产生率。然后将产生速率作为漂移扩散模型的输入,该模型控制半导体组件中的电子和空穴流动,从而预测产生的电流。光学子模型是线性的;然而,电子模型是非线性的。由于肖克利-里德-霍尔对电子-空穴复合率的贡献在高电子/空穴密度下几乎呈线性增加,因此太阳能电池的效率可以随着太阳光浓度的增加而提高。这是通过数值研究来说明的。
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Nonlinear effects in modeling thin-film graded-bandgap solar cells
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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