Spatially selective defect management of CsPbI3 films for high-performance carbon-based inorganic perovskite solar cells

Hailiang Wang, Qixian Zhang, Zedong Lin, Huicong Liu, Xiaozhen Wei, Yongfa Song, Chunyu Lv, Weiping Li, Liqun Zhu, Kexiang Wang, Zhenhua Cui, Lan Wang, Changqing Lin, Penggang Yin, Tinglu Song, Yang Bai*, Qi Chen, Shihe Yang, Haining Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Defects formed at the surface, buried interface and grain boundaries (GB) of CsPbI3 perovskite films considerably limit photovoltaic performance. Such defects could be passivated effectively by the most prevalent post modification strategy without compromising the photoelectric properties of perovskite films, but it is still a great challenge to make this strategy comprehensive to different defects spatially distributed throughout the films. Herein, a spatially selective defect management (SSDM) strategy is developed to roundly passivate various defects at different locations within the perovskite film by a facile one-step treatment procedure using a piperazine-1,4-diium tetrafluoroborate (PZD(BF4)2) solution. The small-size PZD2+ cations could penetrate into the film interior and even make it all the way to the buried interface of CsPbI3 perovskite films, while the BF4 anions, with largely different properties from I anions, mainly anchor on the film surface. Consequently, virtually all the defects at the surface, buried interface and grain boundaries of CsPbI3 perovskite films are effectively healed, leading to significantly improved film quality, enhanced phase stability, optimized energy level alignment and promoted carrier transport. With these films, the fabricated CsPbI3 PSCs based on carbon electrode (C-PSCs) achieve an efficiency of 18.27%, which is among the highest-reported values for inorganic C-PSCs, and stability of 500 h at 85 °C with 65% efficiency maintenance.

Original languageEnglish
Pages (from-to)1050-1060
Number of pages11
JournalScience Bulletin
Volume69
Issue number8
DOIs
Publication statusPublished - 30 Apr 2024

Keywords

  • Carbon electrode
  • CsPbI
  • Defects
  • Spatially selective defect management

Fingerprint

Dive into the research topics of 'Spatially selective defect management of CsPbI3 films for high-performance carbon-based inorganic perovskite solar cells'. Together they form a unique fingerprint.

Cite this