Nearly 30%-efficient low-concentration static photovoltaic modules with IMM triple-junction solar cells

摘要

Two-types of nearly 30%-efficient (27.4%-32.8%) low-concentration static photovoltaic modules with inverted metamorphic triple-junction (IMM-3J) solar cells were designed. The designed concentrator optics with a geometrical concentration ratio of 1.76x have different optical characteristics. The outdoor testing results confirm that daily conversion efficiency of the modules is almost stable between clear-sky and partly cloudy days, which suggests that the modules can utilize both direct and diffuse components of sunlight. Furthermore, the modules generate 30%-40% larger daily electricity compared to a flat Si module and maintain 70%-80% of the electricity of a flat module with the IMM-3J cells, while reducing cell usage.