Rationalizing Light-Induced Phase Segregation Reversal by Halide Oxidation and Diffusion in Mixed Halide Perovskites

IF 19.3 1区材料科学 Q1 CHEMISTRY, PHYSICAL ACS Energy Letters Pub Date : 2025-01-22 DOI:10.1021/acsenergylett.4c0307310.1021/acsenergylett.4c03073

Nuerbiya Aihemaiti, and , Siying Peng*,

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Abstract

Lead halide perovskites are one of the most promising materials as active layers of optoelectronic devices. Phase segregation under illumination in mixed halide perovskites is one of the major issues in stable device operation. Herein, we rationalize illumination power dependent phase segregation phenomena, including two thresholds between which phase segregation occurs, and the reversal of phase segregation. Our experimental observation combining confocal photoluminescence mapping with in situ Raman spectroscopy supports the halide oxidation model. We observed phase segregation beyond the illuminated area, while the illuminated area remained mixed. Reversal of phase segregation under illumination was also observed. We propose that the spatial distribution of phase segregation is driven by halide oxidation and diffusion of the products through mass flow, as verified by light- and spatial-dependent lattice halide vibrations. Our insights into phase segregation may provide new perspectives for manipulating phase segregation by local light intensity for dynamically tunable optoelectronics.

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来源期刊

ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment

CiteScore

31.20

自引率

5.00%

发文量

469

审稿时长

1 months

期刊介绍： ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.