激光器
辐照
硅
材料科学
太阳能电池
光电子学
能量转换效率
功率密度
激光功率缩放
波长
载流子寿命
短路
功率(物理)
降级(电信)
光学
电压
物理
电气工程
核物理学
工程类
量子力学
作者
Yu Zhang,Yunfei Li,Yanjie Li,Guomin Zhao,Minsun Chen
摘要
Compared with traditional methods of energy supply, there is a great possibility to get a more remarkable enhancement of conversion efficiency for laser power (of proper wavelength and intensity) beaming to silicon solar cells. However, it should be noticed that cells may be damaged by high power laser. Based on the background, this essay explores high-power-laser's possible damage to silicon solar cells by analyzing IV curves (obtained by IV tester) and minority-carrier lifetime (measured by open-circuit-voltage-decay method). Research shows that, for 30s irradiation, minority-carrier lifetime decreases to some extent when irradiated by laser of over 5.5W/cm2 and the higher laser power density, the more degradation. Similarly, IV curves see a downward trend under laser of over 5.5W/cm2. In addition, there is a roughly linear relationship between lifetime and the decrease amount of short circuit current. Moreover, the degradation degree has a close relation with the maximum temperature. The prolonged illumination would not bring about more serious damage if one cell had already reached an equilibrium temperature.
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