A Review of Perovskite/Copper Indium Gallium Selenide Tandem Solar Cells

Abstract

In recent years, perovskite solar cells (PSCs) have emerged as a focal point for numerous researchers due to their excellent photoelectric performance. In comparison to their single-junction devices, double-junction cells have exhibited the potential for superior power conversion efficiency (PCE). Copper indium gallium selenide (CIGS) solar cells, a well-established photovoltaic technology, can be used as a viable bottom cell candidate for double-junction tandem solar cells (TSCs). Recently, the PCE of the most advanced 4T perovskite/CIGS TSCs reached 29.9%, while the highest PCE of 2T perovskite/CIGS TSC is 24.2%, which develops relatively slowly. In contrast to the leading perovskite/silicon (Si) TSCs in terms of PCE (PCE2T = 33.9%, PCE4T = 30.35%), perovskite/CIGS TSCs exhibit distinctive advantages such as adjustable bandgap, high absorption coefficient, radiation resistance, and can be prepared on flexible substrates. Building upon these advantages, the optimization process in four-terminal and two-terminal perovskite/CIGS TSCs is elucidated, the key technologies and challenges in material, structure, and photoelectric performance of the tandem cells are summarized, and a prospective analysis of their future overall development in this review is provided. Furthermore, it is hoped to give readers a comprehensive understanding of perovskite/CIGS TSCs.