Efficient and Stable Graded CsPbI3−xBrx Perovskite Solar Cells and Submodules by Orthogonal Processable Spray Coating

Jin Hyuck Heo, Fei Zhang, Chuanxiao Xiao, Su Jeong Heo, Jin Kyoung Park, Joseph J. Berry, Kai Zhu, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Solution-processed CsPbI2Br thin films often suffer from poor film properties, which are indictive of electronic defects that can lead to poor stability. In addition, significant efforts are required to reduce the large cell-to-module performance gap for inorganic perovskite PV devices. Here, we report the fabrication of inorganic CsPbI2Br-based perovskite thin films with a well-defined CsPbI3−xBrx composition gradient by a scalable, orthogonal processable spray-coating approach. The graded structure broadens the absorption wavelength range, increases carrier lifetime, and facilitates charge separation and collection. With this approach, we demonstrated a monolithically integrated perovskite submodule based on the graded CsPbI3−xBrx by spray coating with an efficiency of 13.82% (112-cm2 aperture area) and ∼9% degradation over 1,000-h continuous 1-sun light soaking.

Original languageEnglish
Pages (from-to)481-494
Number of pages14
Issue number2
Publication statusPublished - 2021 Feb 17


  • CsPbIBr
  • graded structure
  • inorganic perovskite
  • light soaking
  • module
  • orthogonal processability
  • solar cells
  • spray coating
  • stability

ASJC Scopus subject areas

  • Energy(all)


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