Enhancing the Stability of Perovskite Solar Cells through an Iodine Confining Strategy

作者：Yang, Hui; Li, Xiaodong^*; Guo, Xuemin; Lu, Chunyan; Yuan, Haobo; Liu, Acan; Zhang, Wenxiao; Fang, Junfeng^*

来源：ACS Energy Letters, 2023, 8(9): 3793-3799.

DOI：10.1021/acsenergylett.3c01330

• LITHIUM-IODINE
• LEAD
• DEGRADATION

One big challenge limiting the stability of perovskitesolar cells(PSCs) is that iodine species produced in perovskite tend to diffuseand escape from PSCs, accelerating perovskite decomposition and destroyingother functional layers as well. Motivated by the idea of iodine confinementin lithium-iodine batteries, here an iodine confining strategyis proposed to fabricate stable PSCs by incorporating poly(2-vinylpyridine)(P2VP) into the perovskite film. P2VP can effectively bond with theiodine product from perovskite decomposition to inhibit its diffusionand volatilization from PSCs, thus suppressing perovskite decompositionand device degradation. The resulting devices show an efficiency of22.97% with good stability in inverted PSCs, retaining 90.9% of theinitial efficiency after 85 & DEG;C for 750 h. In addition, operationalstability is also greatly improved, and 90.0% of its initial efficiencyis retained after MPP tracking for 1000 h.