Four?Terminal Perovskite/Copper Indium Gallium Selenide Tandem Solar Cells: Unveiling the Path to >27% in Power Conversion Efficiency

Over the past decade, impressive progress in power conversion efficiency (PCE) of organometallic halide perovskite solar cells (PSCs), coupled with their ready integration into tandem cells, has led them to approach PCEs 30% for a silicon bottom subcell. However, complementary technology perovskite/copper indium gallium selenide (CIGS) been thus far unable reach similar values. Herein, further advance 4T perovskite/CIGS tandems is demonstrated, increasing PCE up 27.3% via systematic optimization top semitransparent PSC. Improvements light management through anti-reflection coatings, development transparent conductive oxides that incur very low parasitic absorption are reported. It revealed both crucial maximizing and, by utilizing additional optical simulations, detailed loss analysis enables us outline path toward approaching devices developed.