Abstract：The effects of device performance of 1.7 MeV electron irradiation on cadmium telluride polycrystalline thin film solar cells with the structure of anti-radiation glass/ITO/ZnO/CdS/CdTe/ZnTe/ZnTe∶Cu/Ni have been studied. Light and dark I-V characteristics, dark C-V characteristics, quantum efficiency (QE), admittance spectrum (AS) and other testing methods were used to analyze cells performance such as the open-circuit voltage (Voc), short-circuit current (Isc), fill factor (FF) and conversion efficiency (η). It was explored to find out the effects of irradiation on the current transfer characteristic of solar cells combined with the dark current density (Jo), diode ideal factor (A), quantum efficiency, carrier concentration and the depletion layer width. The decline in short-circuit current was very large and the efficiency of solar cells decreased obviously after irradiation. Reverse saturation current density increased, which indicates that p-n junction characteristics of solar cells were damaged, and diode ideal factor was almost the same, so current transport mechanism of solar cells has not changed. Quantum efficiency curves proved that the damage of solar cells’ p-n junction influenced the collection of photo-generated carriers. Irradiation made carrier concentration reduce to 40.6%. The analyses have shown that. A new defect was induced by electron irradiation, whose position is close to 0.58 eV above the valence band in the forbidden band, and capture cross section is 1.78×10-16 cm2. These results indicate that irradiation influences the generation of photo-generated carriers, increases the risk of the carrier recombination and the reverse dark current, and eventually makes the short-circuit current of solar cells decay.
Key words：Anti-radiation glass;Electron irradiation;Current transfer characteristic;CdTe solar cells
田金秀，曾广根*，何绪林，张静全，武莉莉，李 卫，黎 兵，王文武，冯良桓 . 1.7 MeV电子辐照对CdTe太阳电池电流传输特性影响的图谱分析 [J]. 光谱学与光谱分析, 2014, 34(04): 888-893.
TIAN Jin-xiu, ZENG Guang-gen*, HE Xu-lin, ZHANG Jing-quan, WU Li-li, LI Wei, LI Bing, WANG Wen-wu, FENG Liang-huan. Spectral Analysis of the Effects of 1.7 MeV Electron Irradiation on the Current Transfer Characteristic of Cadmium Telluride Solar Cells . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(04): 888-893.
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