Phase Segregation Mechanisms in Mixed-Halide CsPb(BrxI1–x)3 Nanocrystals in Dependence of Their Sizes and Their Initial [Br]:[I] Ratios

IF 5.7 Q2 CHEMISTRY, PHYSICAL

ACS Materials Au Pub Date : 2023-09-06 DOI:10.1021/acsmaterialsau.3c00056

Hannah Funk, Tal Binyamin, Lioz Etgar, Oleksandra Shargaieva, Thomas Unold, Alberto Eljarrat, Christoph T. Koch and Daniel Abou-Ras*,

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Abstract

Phase segregation in inorganic CsPb(Br_xI_1–x)₃ nanoparticles (NPs) exhibiting originally a homogeneous [Br]:[I] mixture was investigated by means of in situ transmission electron microscopy (TEM) and evaluated by using multivariate analyses. The colloidal synthesis of the NPs offers good control of the halide ratios on the nanoscale. The spatially resolved TEM investigations were correlated with integral photoluminescence measurements. By this approach, the halide-segregation processes and their spatial distributions can be described as being governed by the interaction of three partial processes: electron- and photon-irradiation-induced iodide oxidation, local differences in band gap energy, and intrinsic lattice strain. Since the oxidation can be induced by both electron-beam and light irradiation, both irradiation types can induce phase segregation in CsPb(Br_xI_1–x)₃ compounds. This makes in situ TEM a valuable tool to monitor phase transformation in corresponding NPs and thin films on the sub-nm scale.

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混合卤化物CsPb（BrxI1–x）3纳米晶体中的相分离机制与它们的尺寸及其初始[Br]:[I]比率的关系

采用原位透射电子显微镜(TEM)研究了无机CsPb(BrxI1-x)3纳米颗粒(NPs)的相偏析，NPs最初表现为均匀的[Br]:[I]混合物。纳米粒子的胶体合成可以很好地控制纳米尺度上卤化物的比例。空间分辨TEM研究与积分光致发光测量相关。通过这种方法，卤化物偏析过程及其空间分布可以描述为三个部分过程的相互作用:电子和光子辐照诱导的碘化物氧化，带隙能量的局部差异和本征晶格应变。由于电子束和光照射都可以诱导氧化，两种照射方式都可以诱导CsPb(BrxI1-x)3化合物的相偏析。这使得原位TEM成为监测相应NPs和亚纳米尺度薄膜相变的有价值的工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Materials Au 材料科学-

CiteScore

5.00

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0.00%

发文量

期刊介绍： ACS Materials Au is an open access journal publishing letters articles reviews and perspectives describing high-quality research at the forefront of fundamental and applied research and at the interface between materials and other disciplines such as chemistry engineering and biology. Papers that showcase multidisciplinary and innovative materials research addressing global challenges are especially welcome. Areas of interest include but are not limited to:Design synthesis characterization and evaluation of forefront and emerging materialsUnderstanding structure property performance relationships and their underlying mechanismsDevelopment of materials for energy environmental biomedical electronic and catalytic applications