混合卤化物钙钛矿中卤化物氧化和扩散光诱导相偏析逆转的合理化

IF 19.3 1区材料科学 Q1 CHEMISTRY, PHYSICAL

ACS Energy Letters Pub Date : 2025-01-22 DOI:10.1021/acsenergylett.4c03073

Nuerbiya Aihemaiti, Siying Peng

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引用次数: 0

摘要

卤化铅钙钛矿是最有前途的光电器件有源层材料之一。混合卤化物钙钛矿在光照下的相偏析是影响器件稳定运行的主要问题之一。在此，我们合理化了与照明功率相关的相偏析现象，包括发生相偏析的两个阈值，以及相偏析的反转。我们的实验观察将共聚焦光致发光作图与原位拉曼光谱相结合，支持卤化物氧化模型。我们观察到光照区以外的相位偏析，而光照区仍然是混合的。在光照下还观察到相偏析的逆转。我们提出，相偏析的空间分布是由卤化物氧化和产物通过质量流扩散驱动的，正如光和空间依赖的晶格卤化物振动所证实的那样。我们对相偏析的见解可能为动态可调光电子器件的局部光强操纵相偏析提供新的视角。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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

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

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.