中文摘要：

针对色散效应导致聚光多结太阳电池性能降低的问题,使用分布式三维等效电路模型计算高倍聚光下GaInP/GaInAs/Ge三结太阳电池的输出特性,通过分析电池各层的电压分布、暗电流分布以及横向电流分布,研究了不同电池尺寸下色散效应对电池性能影响的机理.结果表明：色散使多结太阳电池在局部区域的光生电流变得不匹配,随着电池尺寸的减小,局部区域之间失配的光生电流能够以横向电流的形式相互补偿,使电池整体的电流更加匹配,从而减小色散效应的影响.当电池芯片尺寸较大（20 mm×20 mm）时,色散主要降低电池的短路电流密度,色散光斑下电池的效率仅相当于无色散时的94%;当电池芯片尺寸减小到2 mm×2 mm时,短路电流密度与无色散时相等,但横向电阻降低了电池的填充因子.当电池芯片尺寸进一步减小到0.4 mm×0.4 mm时,色散与无色散光斑下电池的各项性能几乎没有差别,效率均约为34.5%,色散效应的影响可忽略不计.

英文摘要：

In order to investigate the influence of the chromatic aberration on the performance of multi-junction solar cells,the performance of the triple-junction GalnP/GalnAs/Ge solar cell under high concentration condition is investigated by a three-dimensional（3D） model based on distributed circuit units.Moreover,the effects of chromatic aberration on the performance of solar cells with different sizes are studied by analyzing the distributions of the voltage,the dark current and the transverse current in each layer.It is indicated that the photo-generated current is mismatched in local region of multi-junction solar cell,which is caused by chromatic aberration.However,the mismatched photo-generated current can be compensated for by the form of transverse current,and the current can be better matched when the size of solar cell is reduced.When the size of solar cell is as big as 20 mm × 20 mm,the mismatched photo-generated current is large,so are the transverse current and the dark current.But the transverse current is far less than the dark current,only 12% of the mismatched photo-generated carriers can flow from the edge to the center of the cell through the transverse resistance between the sub-cells,the rest of the photo-generated carriers are lost in the form of dark current,and the cell is in a state of current mismatching.Finally,the chromatic aberration gives rise to a reduction in the short-circuit current density,and the efficiency is only 94% as high as that of non-chromatic aberration.When the size of the cell decreases,the mismatched photo-generated current and the transverse current also decrease gradually,but the dark current caused by the chromatic aberration exponentially decreases more quickly,and the ratio of the transverse current to the mismatched photo-generated current increases gradually.Therefore,the overall state of the current mismatching is alleviated,and the short-circuit current density is increased gradually.Moreover,when the size of solar cell is 2 mm × 2 mm,the transverse current