High-Temperature Driven Recrystallization for Stable Dopant-Free α-FAPbI3 Perovskite Solar Cells

Lingbo Xiao, Xiaoli Xu, Jie Zhao*, Chen Wang, Zheng Lu, Lutao Li, Liang He, Yu Chen, Guifu Zou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

High temperatures facilitate the formation of stable, high-crystallinity α-FAPbI3 films but can lead to the volatilization of organic components in perovskites. Here, a 300 °C hot-press-assisted recrystallization strategy is reported to grow stable phase-pure α-FAPbI3 film without any dopants. High temperature can promote the transformation of δ-FAPbI3 to α-FAPbI3, and induces recrystallization to relieve strain. The applied pressure creates a confined space that effectively prevents the volatilization of organic components in perovskite. The α-FAPbI3 film prepared by hot-press at 300 °C achieves an average grain size of ≈3 µm (with grains up to 10 µm) and demonstrates excellent damp-heat stability, showing no significant change after 20 s in deionized water. The result solar cell delivers a power conversion efficiency as high as 24.06% and retains >70% of their initial efficiency value after 1000 h at 85 °C and 85% relative humidity.

Original languageEnglish
Article number2408684
JournalAdvanced Science
Volume11
Issue number48
DOIs
Publication statusPublished - 26 Dec 2024
Externally publishedYes

Keywords

  • damp-heat stability
  • dopant-free
  • FAPbI perovskite solar cells
  • hot-press
  • recrystallization

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