ACS_Applied Materials & Interfaces


February 16, 2022

Volume 14, Issue 6

Pages 7523-8654

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

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.

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

 ACS Applied Materials & Interfaces | Vol 14, No 6

Image created by minjeong Kim / Nanosphere