Spectroelectrochemical insights into the intrinsic nature of lead halide perovskites

Min, Seonhong; Jeon, Minwook; Cho, Junsang; Bang, Jin Ho; Kamat, Prashant V.

doi:10.1186/s40580-024-00459-w

Title: Spectroelectrochemical insights into the intrinsic nature of lead halide perovskites

Journal Article · 30 November 2024 · Nano Convergence

DOI: https://doi.org/10.1186/s40580-024-00459-w · OSTI ID:2479222

Min, Seonhong; Jeon, Minwook; Cho, Junsang;

; Kamat, Prashant V.

Abstract Lead halide perovskites have emerged as a new class of semiconductor materials with exceptional optoelectronic properties, sparking significant research interest in photovoltaics and light-emitting diodes. However, achieving long-term operational stability remains a critical hurdle. The soft, ionic nature of the halide perovskite lattice renders them vulnerable to various instabilities. These instabilities can be triggered by factors such as photoexcitation, electrical bias, and the surrounding electrolyte/solvent or atmosphere under operating conditions. Spectroelectrochemistry offers a powerful approach to bridge the gap between electrochemistry and photochemistry (or spectroscopy), by providing a comprehensive understanding of the band structure and excited-state dynamics of halide perovskites. This review summarizes recent advances that highlight the fundamental principles, the electronic band structure of halide perovskite materials, and the photoelectrochemical phenomena observed upon photo- and electro-chemical charge injections. Further, we discuss halide instability, encompassing halide oxidation, vacancy formation, ion migration, degradation, and sequential expulsion under electrical bias. Spectroelectrochemical studies that provide a deeper understanding of interfacial processes and halide mobility can pave the way for the design of more robust perovskites, accelerating future research and development efforts. Graphical Abstract

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014334

OSTI ID:: 2479222

Journal Information:: Nano Convergence, Journal Name: Nano Convergence Journal Issue: 1 Vol. 11; ISSN 2196-5404

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Germany

Language:: English

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