Photo-induced halide redistribution in 2D halide perovskite lateral heterostructures

IF 38.6 1区材料科学 Q1 CHEMISTRY, PHYSICAL Joule Pub Date : 2023-10-18 DOI:10.1016/j.joule.2023.08.003

Yanqi Luo , Shuchen Zhang , Jia-Shiang Chen , Xuedan Ma , Ke Ma , Junjing Deng , Yi Jiang , Luxi Li , Barry Lai , Si Chen , Sarah Wieghold , Letian Dou

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Abstract

An improved understanding of the degradation pathways under external stimuli is needed to address stability challenges in two-dimensional (2D) perovskite semiconductor materials. In this study, in situ synchrotron nanoprobe X-ray fluorescence (nano-XRF) is used to investigate the evolution of halide redistribution within various 2D halide perovskite (n = 1–3) lateral heterostructures under ultraviolet (UV) exposure. The results show that iodine (I) experiences a loss in all cases, with the rate of change following the perovskite dimensionality monotonically. In contrast, bromine (Br) is relatively more stable than I in n = 2 and 3 heterostructures, with no significant change in the total Br concentration but a visible amount of Br diffusion to the previously I-rich regime. Combining nano-XRF and X-ray absorption spectroscopy (XAS), we found a reduction of dimensionality in crystals with n > 1 after UV exposure, indicating significant structural reconfiguration beyond ion migration.

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2D卤化物钙钛矿横向异质结构中的光诱导卤化物再分配

需要更好地理解外部刺激下的降解途径，以解决二维（2D）钙钛矿半导体材料的稳定性挑战。在本研究中，原位同步加速器纳米探针X射线荧光（nano-XRF）用于研究紫外线（UV）照射下各种2D卤化物钙钛矿（n=1-3）横向异质结构中卤化物再分配的演变。结果表明，碘（I）在所有情况下都会发生损失，变化率单调地遵循钙钛矿维度。相反，在n=2和3的异质结构中，溴（Br）相对比I更稳定，总Br浓度没有显著变化，但有可见量的Br扩散到以前的富I状态。结合纳米XRF和X射线吸收光谱（XAS），我们发现n>；1，表明离子迁移之外的显著结构重构。

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来源期刊

Joule Energy-General Energy

CiteScore

53.10

自引率

2.00%

发文量

198

期刊介绍： Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.

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