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

14 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

Bibliographical note

Funding Information:
This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science, ICT & Future Planning (Basic Science Research Program (no. 2021R1A5A6002853) and Nano-Material Technology Development Program (no. 2017M3A7B4041696)), the Ministry of Trade, Industry and Energy, Republic of Korea (New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (no.20183010013820)), and the Technology Innovation Program (20012770, High Permeability Thermoplastic Elastomer for Solar Module) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

Publisher Copyright:


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

ASJC Scopus subject areas

  • General Materials Science


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