户外光谱下聚光多结太阳电池电流匹配的优化

OPTIMIZATION OF THE CURRENT MATCHING THE CONCENTRATED MULTI-JUNCTION SOLAR CELLS UNDER THE OUTDOOR SPECTRUM

针对户外变化的太阳光谱对多结太阳电池的电流匹配及效率有较大影响的问题,使用SMARTS软件计算青海格尔木地区全年不同时刻的户外太阳光谱,研究高倍聚光下Ga In P/Ga In As/Ge三结太阳电池在格尔木地区户外的输出特性;通过改变三结太阳电池各子电池的电流匹配,优化三结电池结构。结果表明:在不考虑聚光光学系统影响的情况下,中电池标准光谱响应电流比顶电池小5%的Ga In P/Ga In As/Ge三结太阳电池在格尔木地区全年输出的电量最大;而考虑特定光学系统的影响后,中电池标准光谱响应电流比顶电池小2.5%的Ga In P/Ga In As/Ge三结太阳电池在格尔木地区全年输出的电量最大。

In order to investigate the influence of the outdoor solar spectrum deviation on current matching （CM）and conversion efficiency of multi-junction solar cell, we have calculated the outdoor annual terrestrial solar spectrum in Golmud area by SMARTS software. Moreover, the performance of the triple junction GaInP/GaInAs/Ge solar cell under high concentration conditions is studied. The solar cell structure can be optimized by varying the current matching between different subcells. It is indicated that the power generation will reach the maximum when the current of middle GaInAs cell is 5% less than top GaInP cell without considering of the influence of the optical system. Furthermore, by adding the certain concentration optical system factor, the maxima will appear at the current of middle cell is 2.5% less than the top cell.