Fully Scalable and Stable CsPbI2Br Solar Cells Realized by an All-Spray-Coating Process

David Sunghwan Lee, Min Jeong Ki, Hyong Joon Lee, Jin Kyoung Park, Seok Yeong Hong, Bong Woo Kim, Jin Hyuck Heo, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Spray-coating is a scalable and time-efficient technique for the development of large-area metal halide perovskite (MHP) solar cells. However, a bottleneck still exists toward the development of fully scalable n-i-p-type MHP solar cells particularly on spray-coating the hole transporting layer (HTL). Here, we present a reliable strategy of spray-coating the HTL by using MoO2 nanoparticles with small amounts of poly(triarylamine) (PTAA) binders to ensure uniform coverage and efficient charge extraction. By spray-coating all layers except the Au electrode, we achieve high and scalable efficiencies of 14.26 and 13.88% for CsPbI2Br unit cells (0.12 cm2) and submodules (25 cm2), respectively. We then extend toward an all-spray-coating process by spray-coating carbon black as the top counter electrode, resulting in a submodule efficiency of 10.08%. Finally, we also demonstrate good long-term stability of the submodules under damp heat conditions (85 °C/85% relative humidity) over 1000 h.

Original languageEnglish
Pages (from-to)7926-7935
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number6
Publication statusPublished - 2022 Feb 16


  • MoOhole transport layer
  • all-inorganic CsPbIBr
  • all-spray-coating process
  • carbon black electrode
  • fully scalable

ASJC Scopus subject areas

  • Materials Science(all)


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