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 Park, Joseph Berry, Kai Zhu

Research output: Contribution to journalArticlepeer-review

81 Scopus Citations

Abstract

Inorganic perovskite solar cells (PSCs) are promising for achieving long-term operational stability with good device performance. Here, we report the fabrication of inorganic CsPbI2Br-based perovskite thin films with a well-defined CsPbI3-xBrx composition gradient in the surface region by a scalable, orthogonal processable spray-coating approach. The graded structure broadens absorption wavelength range and increases carrier lifetime, but it also causes electrical field redistribution within a device stack for more efficient charge separation and collection. With this approach, we obtained a power conversion efficiency of 16.81% for a 0.096-cm2 PSC. We further 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 languageAmerican English
Pages (from-to)481-494
Number of pages14
JournalJoule
Volume5
Issue number2
DOIs
StatePublished - 2021

NREL Publication Number

  • NREL/JA-5900-78348

Keywords

  • CsPbI2Br
  • modules
  • perovskite
  • solar cells
  • spray coating

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