Abstract A detailed understanding of charge-carrier behavior could provide new avenues to improve the performance of the solar cell by enhancing the active materials and electronic properties. In the present work, the transport mechanism of photogenerated carriers in Cu(In,Ga)Se2 or CIGS)-based solar cells is investigated by analysis of the temperature-dependent current density-voltage (J-V) curves obtained under various illumination (i.e., dark, AM 1.5G, 650 nm, and 405 nm). The results demonstrate that J-V curve distortion, termed the “roll-over” effect, is significantly correlated with the illumination wavelength and, more importantly, is strongly associated with the persistent characteristics of the CIGS solar cell. In addition, the nature of the photo-induced defects and their influence on the transport mechanism of the photogenerated carriers were investigated via deep level capacitance profiling (DLCP) and admittance spectroscopy (AS) under various illumination conditions. The photo-capacitance results indicate distinct spatial distributions and persistent behaviors depending upon the illumination wavelength. Based on the findings in this work, the origin of the non-ideal J-V behavior in the CIGS solar cell is explained, and the spatial defect distribution and illumination wavelength sensitivity are discussed.

中文翻译：

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Cu(In,Ga)Se2薄膜太阳能电池中光生载流子的光致缺陷和动力学

摘要 对电荷载流子行为的详细了解可以通过增强活性材料和电子特性来提高太阳能电池的性能。在目前的工作中，通过分析在各种光照下获得的温度相关电流密度 - 电压（JV）曲线，研究了基于 Cu（In，Ga）Se2 或 CIGS）的太阳能电池中光生载流子的传输机制（即，暗、AM 1.5G、650 nm 和 405 nm）。结果表明，称为“翻转”效应的 JV 曲线失真与照明波长显着相关，更重要的是，与 CIGS 太阳能电池的持久特性密切相关。此外，通过深能级电容分析（DLCP）和导纳光谱（AS）在各种光照条件下研究了光致缺陷的性质及其对光生载流子传输机制的影响。光电容结果表明不同的空间分布和持久的行为取决于照明波长。基于这项工作的发现，解释了 CIGS 太阳能电池中非理想合资行为的起源，并讨论了空间缺陷分布和照射波长敏感性。光电容结果表明不同的空间分布和持久的行为取决于照明波长。基于这项工作的发现，解释了 CIGS 太阳能电池中非理想合资行为的起源，并讨论了空间缺陷分布和照射波长敏感性。光电容结果表明不同的空间分布和持久的行为取决于照明波长。基于这项工作的发现，解释了 CIGS 太阳能电池中非理想合资行为的起源，并讨论了空间缺陷分布和照射波长敏感性。