Critical Role of Organoamines in the Irreversible Degradation of a Metal Halide Perovskite Precursor Colloid: Mechanism and Inhibiting Strategy

Qingshun Dong, Wenzhe Shang, Xiaoqiang Yu, Yanfeng Yin, Chen Jiang, Yulin Feng, Jiming Bian, Bo Song, Shengye Jin, Yuanyuan Zhou, Liduo Wang, Yantao Shi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Solution processability enables perovskite solar cells (PSCs) as a potentially advantageous candidate over the conventional vacuum-based photovoltaic technologies. Nevertheless, the stability issue of the metal halide perovskite (MHP) precursor colloids seriously retards the future industrialization of PSCs. Herein we elucidate the key role of organoamines─deprotonated organoamine cations─in the degradation of the most commercially promising formamidinium/methylammonium (FA+/MA+) mixed cation MHP precursor and determine that the amine-cation reaction of FA-MA+, rather than MA-FA+, is the main route triggering the irreversible degradation process. Subsequently, based on Schiff-base reactions, aldehydes (such as formaldehyde, benzaldehyde, and 3-thenaldehyde) are used to eliminate organoamines for effective suppression of the irreversible degradation of precursors and passivation of H-vacancy traps in the resultant MHP thin films. Furthermore, the optimal benzaldehyde can lead to reduced grain-boundary density to enhance the power conversion efficiency of PSCs from 20.7% to 23.3% with simultaneous improvement in the operational stability.
Original languageEnglish
Pages (from-to)481-489
Number of pages9
JournalACS Energy Letters
Volume7
Issue number1
Early online date30 Dec 2021
DOIs
Publication statusPublished - 14 Jan 2022

Scopus Subject Areas

  • Chemistry (miscellaneous)
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment

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