TY - JOUR
T1 - Complementary bulk and surface passivations for highly efficient perovskite solar cells by gas quenching
AU - Tang, Shi
AU - Bing, Jueming
AU - Zheng, Jianghui
AU - Tang, Jianbo
AU - Li, Yong
AU - Mayyas, Mohannad
AU - Cho, Yongyoon
AU - Jones, Timothy W.
AU - Yang, Terry Chien Jen
AU - Yuan, Lin
AU - Tebyetekerwa, Mike
AU - Nguyen, Hieu T.
AU - Nielsen, Michael P.
AU - Ekins-Daukes, N. J.
AU - Kalantar-Zadeh, Kourosh
AU - Wilson, Gregory J.
AU - McKenzie, David R.
AU - Huang, Shujuan
AU - Ho-Baillie, Anita W.Y.
N1 - Publisher Copyright:
© 2021 The Author(s)
PY - 2021/8/18
Y1 - 2021/8/18
N2 - The power conversion efficiency (PCE) of metal halide perovskite solar cells (PSCs) has improved dramatically from 3.8% to 25.5% in only a decade. Gas quenching is a desirable method for fabricating high-efficiency cells as it does not consume antisolvents and is compatible with large-area deposition methods such as doctor blading and slot-die coating. To further improve PCEs for gas-quenched PSCs, here, we develop complementary bulk and surface passivation strategies by incorporating potassium iodide (KI) in the perovskite precursor and applying n-hexylammonium bromide (HABr) to the perovskite surface. We show that (1) KI induces a spatial-compositional change, improving grain boundary properties; (2) KI and HABr reduce traps, especially at levels close to the mid-gap; and (3) HABr greatly improves the built-in potential of the device, thereby improving voltage output. The champion device achieves a steady-state PCE of 23.6% with a VOC of 1.23V, which is, to the best of our knowledge, the highest for PSC by gas quenching to date.
AB - The power conversion efficiency (PCE) of metal halide perovskite solar cells (PSCs) has improved dramatically from 3.8% to 25.5% in only a decade. Gas quenching is a desirable method for fabricating high-efficiency cells as it does not consume antisolvents and is compatible with large-area deposition methods such as doctor blading and slot-die coating. To further improve PCEs for gas-quenched PSCs, here, we develop complementary bulk and surface passivation strategies by incorporating potassium iodide (KI) in the perovskite precursor and applying n-hexylammonium bromide (HABr) to the perovskite surface. We show that (1) KI induces a spatial-compositional change, improving grain boundary properties; (2) KI and HABr reduce traps, especially at levels close to the mid-gap; and (3) HABr greatly improves the built-in potential of the device, thereby improving voltage output. The champion device achieves a steady-state PCE of 23.6% with a VOC of 1.23V, which is, to the best of our knowledge, the highest for PSC by gas quenching to date.
KW - compositional change
KW - defect passivation
KW - gas quenching
KW - perovskite solar cell
UR - https://www.scopus.com/pages/publications/85112211398
U2 - 10.1016/j.xcrp.2021.100511
DO - 10.1016/j.xcrp.2021.100511
M3 - Article
AN - SCOPUS:85112211398
SN - 2666-3864
VL - 2
JO - Cell Reports Physical Science
JF - Cell Reports Physical Science
IS - 8
M1 - 100511
ER -
