A Self-Assembled 3D/0D Quasi-Core–Shell Structure as Internal Encapsulation Layer for Stable and Efficient FAPbI3 Perovskite Solar Cells and Modules

Yuqi Wang, Chao Yang, Zhen Wang*, Gu Li, Zhengchi Yang, Xinyang Wen, Xiaowen Hu*, Yue Jiang, Shien-Ping Feng, Yiwang Chen, Guofu Zhou, Jun-Ming Liu, Jinwei Gao*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

9 Citations (Scopus)

Abstract

FAPbI3 perovskites have garnered considerable interest owing to their outstanding thermal stability, along with near-theoretical bandgap and efficiency. However, their inherent phase instability presents a substantial challenge to the long-term stability of devices. Herein, this issue through a dual-strategy of self-assembly 3D/0D quasi-core–shell structure is tackled as an internal encapsulation layer, and in situ introduction of excess PbI2 for surface and grain boundary defects passivating, therefore preventing moisture intrusion into FAPbI3 perovskite films. By utilizing this method alone, not only enhances the stability of the FAPbI3 film but also effectively passivates defects and minimizes non-radiative recombination, ultimately yielding a champion device efficiency of 23.23%. Furthermore, the devices own better moisture resistance, exhibiting a T80 lifetime exceeding 3500 h at 40% relative humidity (RH). Meanwhile, a 19.51% PCE of mini-module (5 × 5 cm2) is demonstrated. This research offers valuable insights and directions for the advancement of stable and highly efficient FAPbI3 perovskite solar cells. © 2023 Wiley-VCH GmbH.
Original languageEnglish
Article number2306954
JournalSmall
Volume20
Issue number14
Online published21 Nov 2023
DOIs
Publication statusPublished - 4 Apr 2024

Research Keywords

  • 3D/0D quasi-core-shell
  • CsPbBr3 quantum dots
  • in situ passivation
  • perovskite solar cells

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