Surface engineering with oxidized Ti3C2Tx MXene enables efficient and stable p-i-n-structured CsPbI3 perovskite solar cells

Jin Hyuck Heo, Fei Zhang, Jin Kyoung Park, Hyong Joon Lee, David Sunghwan Lee, Su Jeong Heo, Joseph M. Luther, Joseph J. Berry, Kai Zhu, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

All-inorganic CsPbI3 perovskite has a near-ideal band gap, high thermal stability, and simple material composition, thus presenting a promising option for developing perovskite/Si tandem solar cells. However, CsPbI3 undergoes a rapid phase transition under exposure to moisture and exhibits a significant performance gap relative to other perovskite compounds, particularly in the p-i-n structure favored for perovskite/Si tandems. Here, we demonstrate highly efficient and stable p-i-n-structured CsPbI3 perovskite solar cells by surface engineering the CsPbI3 layer with oxidized Ti3C2Tx MXene (OMXene) nanoplates via spray coatings. OMXene provides a physical barrier against moisture and improves charge separation at the perovskite-electron transporting layer interface via an enhanced electric field. Consequently, we demonstrated CsPbI3/OMXene-based p-i-n devices with efficiencies of 19.69% for 0.096-cm2 cells and 14.64% for 25-cm2 minimodules. The encapsulated minimodule showed good stability, retaining ∼85% of the initial efficiency under simultaneous damp heat (85°C/85% relative humidity) and 1-sun light soaking for over 1,000 h.

Original languageEnglish
Pages (from-to)1672-1688
Number of pages17
JournalJoule
Volume6
Issue number7
DOIs
Publication statusPublished - 2022 Jul 20

Keywords

  • CsPbI3
  • inverted device structure
  • minimodule
  • oxidized MXene
  • perovskite solar cells
  • spray coating
  • stability

ASJC Scopus subject areas

  • Energy(all)

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