Excess PbI2 Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells

Hengkai Zhang, Wei Yu, Junxue Guo, Chao Xu, Zhiwei Ren, Kuan Liu, Guang Yang, Minchao Qin, Jiaming Huang, Zhiliang Chen, Qiong Liang, Dong Shen, Zehan Wu, Yaokang Zhang, Hrisheekesh Thachoth Chandran, Jianhua Hao, Ye Zhu, Chun sing Lee, Xinhui Lu, Zijian ZhengJinsong Huang, Gang Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Excess PbI2 in perovskite film is an effective strategy for boosting perovskite solar cells (PSCs) performance. However, the presence of unreacted PbI2 is a critical source of intrinsic instability in perovskite under illumination, due to the photolysis of PbI2 (decomposed into metallic lead and iodine). Herein, this issue is solved by applying ionic liquids (ILs) on PSCs where the ILs can form types of stable supramolecules with residual lead iodide. The formation process and mechanism of the supramolecules are elucidated. The residual PbI2 is also revealed to cause high level lead interstitial defects and induced tensile strain which further deteriorate device performance. The self-assembled supramolecular complex can passivate the PSCs where significant enhancements are achieved in both power conversion efficiency (PCE, from 21.9% to 23.4%) and device stability (retaining 95% of the initial PCE after 4080 h in ambient dry-air storage, and 80% after 1400 h continuous light illumination).

Original languageEnglish
Article number2201663
Pages (from-to)1-11
Number of pages11
JournalAdvanced Energy Materials
Volume12
Issue number35
DOIs
Publication statusPublished - 15 Sep 2022

Keywords

  • excess PbI management
  • ionic liquids
  • perovskite solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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