Comparison and integration of CuInGaSe and perovskite solar cells

The rapidly developing perovskite solar cells (PSCs) provide a new and promising choice of thin film solar cells due to their attractive attributes. Among the commercialized thin film solar cells, CuInGaSe (CIGS) cells demonstrate higher efficiency than amorphous Si photovoltaic devices and lower toxicity than CdTe cells. Therefore, a wide variety of studies have been conducted on them. Here, we elucidate CIGS materials and perovskites as absorber in thin film solar cells in terms of structure and optoelectronic properties. Furthermore, a comparison of PSCs and commercialized CIGS cells is made from the point of view of fabrication process, stability, and toxicity. In addition, the integration of CIGS devices and PSCs is elaborated based on tandem architecture. Finally, prospects for the advancement of CIGS cells and PSCs are discussed.