期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 220, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.solmat.2020.110860
关键词
Cu(In,Ga)Se-2 thin film solar cells; Photo-induced defect; J-V distortion; Persistent photo-capacitance; Band structures
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2018R1A6A1A03025340]
- Technology Development Program to Solve Climate Changes of the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2016M1A2A2936753, 2016M1A2A2936784]
- Korea Institute of Energy Research (KIER) [C0-2451]
This study investigated the transport mechanism of photogenerated carriers in CIGS solar cells by analyzing temperature-dependent current density-voltage curves, revealing that the distortion of J-V curves is closely related to the illumination wavelength and persistent characteristics of the solar cell. Additionally, photo capacitance results showed distinct spatial distributions and behaviors under different illumination conditions.
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)Se-2 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.
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