A Review of Perovskite/CIGS Tandem Solar Cells

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 has reached 29.9% [1] , while the highest PCE of 2T perovskite/CIGS TSC is 24.2% [2] , which develops relatively slowly. In contrast to the leading perovskite/silicon (Si) TSCs in terms of PCE (PCE 2T =33.9% [3] , PCE 4T =30.35% [4] ), perovskite/CIGS TSCs exhibit distinctive advantages such as adjustable band gap, high absorption coefficient, radiation resistance, and can be prepared on flexible substrates. Building upon these advantages, we elucidate the optimization process in 4‐terminal (4T) and 2‐terminal (2T) perovskite/CIGS TSCs, summarize the key technologies and challenges in material, structure, and photoelectric performance of the tandem cells, and provide a prospective analysis of their future overall development in this review. Furthermore, we hope to give readers a comprehensive understanding of perovskite/CIGS TSCs. This article is protected by copyright. All rights reserved.