Comparison of CPV systems with lattice-matched and mismatched solar cells in long-term outdoor performance

Concentrator photovoltaic (CPV) system is promising as the next generation PV using ultrahigh efficiency multi-junction solar cells. In the CPV, optics concentrate sunlight, thereby reducing the area occupied by solar cells and reducing cost. In this study, we analyzed the two CPV systems installed in University of Miyazaki in a long-term outdoor operation. One is composed of the lattice-matched type of the most common triple-junction solar cell, and the other is composed of the lattice-mismatched type. As a result, the performance was different from each other with respect to the module temperature.