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

作者：Minghao Li, Junjie Zhou, Liguo Tan, Hang Li, Yue Liu, Chaofan Jiang, Yiran Ye, Liming Ding, Wolfgang Tress, Chenyi Yi · 发表于：The Innovation · 年份：2022 · DOI：10.1016/j.xinn.2022.100310 · 被引用次数：112 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Organic Electronics and Photovoltaics

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.