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

231 Scopus citations


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
Issue number8
StatePublished - Feb 19 2021
Externally publishedYes

Bibliographical note

Funding Information:
Z.X. acknowledges support from the National Natural Science Foundation of China (61975106) and the Shaanxi Technical Innovation Guidance Project (2018HJCG‐17). S.L. acknowledges the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17040506), the National Key Research and Development Program of China (2016YFA0202403), the National University Research Fund (GK261001009), the Innovative Research Team (IRT_14R33), the 111 Project (B14041), the Chinese National 1000‐Talents‐Plan Program, and the Shanxi Science and Technology Department (20201101012). The unfunded collaborative work of S.P. and D.Y. was supported through the International Institute of Biosensing (IIB) headquartered at Penn State University.

Publisher Copyright:
© 2020 Wiley-VCH GmbH


  • energy levels
  • ionic liquids
  • passivation
  • perovskites
  • stability

PubMed: MeSH publication types

  • Journal Article


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