journal article·2022-01-14

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

ACS Energy Letters· Volume 7· Issue 1
Publisher page

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.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy Sciences, Dalian 116023, P.R. China

Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China

Department of Physics, Hong Kong Baptist University, Kowloon, Hong Kong SAR, China

Smart Society Laboratory, Hong Kong Baptist University, Kowloon, Hong Kong SAR, China

Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China

Funding

Research Grants Council, University Grants Committee · Liaoning Revitalization Talents Program · Hong Kong Baptist University · China Postdoctoral Science Foundation · National Natural Science Foundation of China · Dalian Science and Technology Innovation Fund · Special funds for science and technology development under the guidance of the central government

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