An ammonium-pseudohalide ion pair for synergistic passivating surfaces in FAPbI3 perovskite solar cells

Jungan Wang, Hongzhuang Ma, Aifei Wang, Zihao Li, Jingjin Dong, You Liu, Song Gao, Suhao Yan, Xianglin Chen, Ya Li, Zichao Wu, Wenxin Xu, Fang Liu, Fangfang Wang, Wei Huang, Tianshi Qin

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Either cationic ammonium or anionic pseudohalide compounds can passivate partial defects in perovskite solar cells (PSCs); however, their ion-pairing combination has rarely been studied because of its rarity. We present an ion-pairing passivating agent, diethylammonium diethyldithiocarbamate, synchronously providing both cationic and anionic ions, which can convert the surfaces of lead halide perovskite into two types of water-resistant compositions by forming strong chemical bonds. These synergistic capping compositions also reduce the defect density in the surface and bulk domains by passivating defect-nucleating sites, which can modify the surface energy level toward boosted photovoltage to 1.122 V and efficiency to 23.21% for pure-phase FAPbI3 PSCs. In addition, their water-resistant features can effectively prevent moisture damage into the perovskite layer and significantly elongate device stabilities.

Original languageEnglish
Pages (from-to)2209-2224
Number of pages16
JournalMatter
Volume5
Issue number7
DOIs
StatePublished - 6 Jul 2022

Keywords

  • FAPbI perovskite
  • MAP3: Understanding
  • anionic diethyldithiocarbamate
  • cationic diethylammonium
  • ion-pairing passivator
  • synergistic passivating

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