Critical Role of Removing Impurities in Nickel Oxide on High-Efficiency and Long-Term Stability of Inverted Perovskite Solar Cells

Shuangjie Wang, Yuke Li, Jiabao Yang, Tong Wang, Bowen Yang, Qi Cao, Xingyu Pu, Lioz Etgar, Jian Han, Junsong Zhao, Xuanhua Li*, Anders Hagfeldt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

The performance enhancement of inverted perovskite solar cells applying nickel oxide (NiOx) as the hole transport layer (HTL) has been limited by impurity ions (such as nitrate ions). Herein, we have proposed a strategy to obtain high-quality NiOx nanoparticles via an ionic liquid-assisted synthesis method (NiOx-IL). Experimental and theoretical results illustrate that the cation of the ionic liquid can inhibit the adsorption of impurity ions on nickel hydroxide through a strong hydrogen bond and low adsorption energy, thereby obtaining NiOx-IL HTL with high conductivity and strong hole-extraction ability. Importantly, the removal of impurity ions can effectively suppress the redox reaction between the NiOx film and the perovskite film, thus slowing down the deterioration of device performance. Consequently, the modified inverted device shows a striking efficiency exceeding 22.62 %, and superior stability maintaining 92 % efficiency at a maximum power point tracking under one sun illumination for 1000 h.

Original languageAmerican English
Article numbere202116534
JournalAngewandte Chemie - International Edition
Volume61
Issue number18
Early online date17 Feb 2022
DOIs
StatePublished - 25 Apr 2022

Bibliographical note

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • Hole Transport Layer
  • Interfacial Redox Reaction
  • Nickel Oxide
  • Perovskite Solar Cells

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