Issue 5, 2022

Role of electrochemical reactions in the degradation of formamidinium lead halide hybrid perovskite quantum dots

Abstract

Organic–inorganic hybrid perovskites are widely utilized in solar driven chemistry such as photocatalysis, hydrogen evolution, and oxygen reduction. Hybrid perovskites contain various components with high polarity and/or charge values, which undergo transformations due to ion exchange, photoinduced phase segregation, or ion migration. These variable characteristics make perovskites “soft materials”. Meanwhile, optoelectronic devices often operate under electrochemical reactions in the presence of an electrical field. To examine the effect of this field on the material/photophysical properties of hybrid perovskites, hybrid FAPbBr3 (FA+: CH(NH2)2+) perovskite quantum dots (PQDs) were synthesized. In this study, we report the spectroelectrochemical investigation of the hybrid FAPbBr3 PQDs to understand the electrochemical stability and degradation process. We also found that the electrochemical condition played an important role in inducing defect-mediated oxidation/reduction reactions, changing the photophysical properties of hybrid PQDs, and causing their irreversible transformations to various lead halide plumbate complexes. These findings can help develop a strategy for enhancing the operational performance of PQDs for the solar driven chemistry.

Graphical abstract: Role of electrochemical reactions in the degradation of formamidinium lead halide hybrid perovskite quantum dots

Supplementary files

Article information

Article type
Paper
Submitted
22 Oct 2021
Accepted
30 Jan 2022
First published
31 Jan 2022

Analyst, 2022,147, 841-850

Role of electrochemical reactions in the degradation of formamidinium lead halide hybrid perovskite quantum dots

K. Kim, Y. Shin, C. Lee, H. Jeon, S. J. Yoon and D. Han, Analyst, 2022, 147, 841 DOI: 10.1039/D1AN01924D

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