High-Efficiency Perovskite Solar Cells with Imidazolium-Based Ionic Liquid for Surface Passivation and Charge Transport

Xuejie Zhu, Minyong Du, Jiangshan Feng, Hui Wang, Zhuo Xu, Likun Wang, Shengnan Zuo, Chenyu Wang, Ziyu Wang, Cong Zhang, Xiaodong Ren, Shashank Priya, Dong Yang, Shengzhong Liu

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3-dimethyl-3-imidazolium hexafluorophosphate (DMIMPF6) ionic liquid (IL) is adopted to passivate the surface of a formamidinium-cesium lead iodide perovskite (Cs0.08FA0.92PbI3) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb-cluster and Pb-I antisite defects can be effectively passivated by [DMIM]+ bonding with the Pb2+ ion on the perovskite surface, leading to significantly suppressed non-radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF6-treated perovskite device demonstrated long-term stability because the hydrophobic DMIMPF6 layer blocked moisture permeation.

Original languageEnglish (US)
Pages (from-to)4238-4244
Number of pages7
JournalAngewandte Chemie - International Edition
Volume60
Issue number8
DOIs
StatePublished - Feb 19 2021

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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