Based on a commercial CIGS solar cell, Midsummer engineers, by working with researchers at Prof. Yang Yang’s laboratory of University of California, Los Angeles (UCLA), have demonstrated a four-terminal perovskite-CIGS tandem solar cell reaching 24.9% efficiency. Midsummer is a leading Swedish developer and manufacturer of thin film CIGS solar cells. Recently, by a joint project with Prof. Yang, they have demonstrated a 4-terminal perovskite-CIGS tandem solar cell. It is based on a perovskite...