Multifunctional succinate additive for flexible perovskite solar cells with more than 23% power-conversion efficiency

• DOI: 10.1016/j.xinn.2022.100310
• Publication Date: 2022-09-06T03:44:19Z
• Authors: Minghao Li; Junjie Zhou; Liguo Tan; Hang Li; Yue Liu; Chaofan Jiang; Yiran Ye; Liming Ding; Wolfgang Tress; Chenyi Yi
• Keywords: Q1-390; 621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnik; Science (General); 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 7. Clean energy; Article; 0104 chemical sciences

Flexible perovskite solar cells (FPSCs) have emerged as power sources in versatile applications owing to their high-efficiency characteristics, excellent flexibility, and relatively low cost. Nevertheless, undesired strain in perovskite films greatly impacts the power-conversion efficiency (PCE) and stability of PSCs, particularly in FPSCs. Herein, a novel multifunctional organic salt, methylammonium succinate, which can alleviate strain and reinforce grain boundaries, was incorporated into the perovskite film, leading to relaxed microstrain and a lower defect concentration. As a result, a PCE of 25.4% for rigid PSCs and a record PCE of 23.6% (certified 22.5%) for FPSCs have been achieved. In addition, the corresponding FPSCs exhibited excellent bending durability, maintaining ∼85% of their initial efficiency after bending at a 6 mm radius for 10 000 cycles.