Non-circuit theory drift-diffusion numerical simulation of standard potentiostatic impedance spectroscopy (IS) is a well-known strategy for characterization of materials and electronic devices. It implies the time-dependent solutions from the continuity and Poisson's equations under small perturbation of the bias boundary condition at the electrodes. But in the case of photo-sensitive devices a small light perturbation can be also taken modulating the generation rate along the absorber bulk. In that focus, this work approaches a set of analytical solutions for the signals of IS and intensity modulated photocurrent and photovoltage spectroscopies, IMPS and IMVS respectively, from one-sided p-n junction solar cells at open-circuit. Subsequently, a photo-impedance signal named light intensity modulated impedance spectroscopy (LIMIS equals IMVS over IMPS) is analytically simulated and its difference with respect to IS suggests a correlation with the surface charge carrier recombination velocity. This is an illustrative result and starting point for future more realistic numerical simulations.

中文翻译：

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全固态 pn 结太阳能电池开路光调制阻抗谱 (LIMIS) 的分析模型

标准恒电位阻抗谱 (IS) 的非电路理论漂移扩散数值模拟是表征材料和电子设备的众所周知的策略。它意味着在电极偏置边界条件的小扰动下，连续性和泊松方程的时间相关解。但是在光敏器件的情况下，也可以采用小的光扰动来调节沿吸收体块的生成速率。在这个焦点上，这项工作分别针对来自开路单侧 pn 结太阳能电池的 IS 信号和强度调制光电流和光电压光谱、IMPS 和 IMVS 的信号提出了一组解析解。随后，一个名为光强度调制阻抗谱（LIMIS 等于 IMVS 超过 IMPS）的光阻抗信号被分析模拟，其与 IS 的差异表明与表面电荷载流子复合速度的相关性。这是一个说明性的结果，也是未来更现实数值模拟的起点。