Phase Stability Improvement of a γ-CsPbI3 Perovskite Solar Cell Utilizing a Barium Bis(trifluoromethanesulfonimide) Solution

Chanyong Lee, Kyungjin Chae, Yohan Ko, Changhyun Lee, Taemin Kim, Seaeun Park, Moo Young Jung, Jinhyoung Kim, Yong Ju Yun, Minoh Lee, Yongseok Jun

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The cesium lead iodide (CsPbI3) perovskite solar cell possesses a wide band gap ranging from 1.65 to 1.75 eV, which is suitable for integration into a tandem structure along with a low-band-gap silicon solar cell. Moreover, CsPbI3 has received considerable attention as a potential solution for the prevalent issues of low thermal stability of organic-inorganic perovskite solar cells and phase segregation encountered in conventional mixed halide wide-band-gap perovskite solar cells. Through the implementation of volatile additives, CsPbI3 has demonstrated substantial advancements in efficiency, process temperature, and stability. This study introduces a novel approach for barium (Ba)-doping by spraying an antisolvent containing barium bis(trifluoromethanesulfonimide) during the spin-coating process. By incorporating Ba2+ through this spraying technique, the formation of the delta phase in CsPbI3 is significantly suppressed; thereby, a power conversion efficiency of 18.56% is achieved, and a remarkable 93% of the initial efficiency is maintained after 600 h.

Original languageEnglish
Pages (from-to)51050-51058
Number of pages9
JournalACS Applied Materials and Interfaces
Volume15
Issue number44
DOIs
Publication statusPublished - 2023 Nov 8

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

Keywords

  • Ba-doping
  • doping via antisolvent
  • inorganic perovskite solar cell
  • phase stability
  • γ-CsPbI

ASJC Scopus subject areas

  • General Materials Science

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