posted on 2022-01-18, 15:04authored byDavid
Sunghwan Lee, Min Jeong Ki, Hyong Joon Lee, Jin Kyoung Park, Seok Yeong Hong, Bong Woo Kim, Jin Hyuck Heo, Sang Hyuk Im
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.