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

Minghao Li; Junjie Zhou; Liguo Tan; Hang Li; Yue Liu; Chaofan Jiang; Yiran Ye; Liming Ding; Wolfgang Tress; Chenyi Yi

doi:10.1016/j.xinn.2022.100310

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

Innovation (Camb). 2022 Sep 6;3(6):100310. doi: 10.1016/j.xinn.2022.100310. eCollection 2022 Nov 8.

Authors

Minghao Li¹, Junjie Zhou¹, Liguo Tan¹, Hang Li¹, Yue Liu¹, Chaofan Jiang¹, Yiran Ye¹, Liming Ding², Wolfgang Tress³, Chenyi Yi¹

Affiliations

¹ State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China.
² Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, China.
³ Institute of Computational Physics (ICP), ZHAW School of Engineering, Wildbachstr. 21, Winterthur 8400, Switzerland.

Abstract

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.