Ionic liquid functionalized tin halide perovskite investigated by STXM and spectro-ptychography

IF 1.5 4区物理与天体物理 Q2 SPECTROSCOPY Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2023-05-01 DOI:10.1016/j.elspec.2023.147330

Tianxiao Sun , Shengnan Zuo , Bo He , Xinye Yuan , Guixiang Li , Jigang Zhou , Markus Weigand , Antonio Abate , Jian Wang

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引用次数: 1

Abstract

The structural and compositional properties of tin halide perovskites (CH(NH₂)₂SnI₃, FASnI₃) with and without an ionic liquid of 1-Ethyl-3-methylimidazolium bis(trifluormethylsulfonyl) imide (EMITFSI) were investigated using the scanning transmission soft X-ray microscopy (STXM) and spectro-ptychography techniques at the Sn M_5,4-edge, I M_5,4-edge, O K-edge, C K-edge, and N K-edge. The study offers a comprehensive interpretation of the spectral characteristics of main components (C, N, Sn, and I) in Sn-based perovskites through STXM-based techniques and further reveals differences between the perovskite samples with and without adding EMITFSI ionic liquid. The chemical imaging of Sn and I shows that the perovskite sample without ionic liquid has Sn-rich regions in iodine cavities, while the ionic liquid-treated sample exhibits a more homogeneous perovskite phase. Furthermore, the C and N K-edge XANES resonance features support the interaction between the non-volatile ionic liquid and FA⁺, thus playing a protective role in the formation and stabilization of perovskite phase.

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离子液体功能化卤化锡钙钛矿的STXM和光谱技术研究

采用扫描透射软x射线显微镜(STXM)和光谱学技术研究了卤化锡钙钛矿(CH(NH2)2SnI3, FASnI3)在加入和不加入1-乙基-3-甲基咪唑双(三氟甲基磺酰基)亚胺(EMITFSI)离子液体时Sn M5、4边、I M5、4边、O k边、C k边和N k边的结构和组成性质。本研究通过stxm技术全面解释了Sn基钙钛矿中主要成分(C、N、Sn和I)的光谱特征，进一步揭示了添加EMITFSI离子液体和未添加EMITFSI离子液体的钙钛矿样品之间的差异。Sn和I的化学成像表明，未经离子液体处理的钙钛矿样品在碘腔中具有富锡区，而离子液体处理的样品则表现出更均匀的钙钛矿相。此外，C和N k边XANES共振特征支持非挥发性离子液体与FA+之间的相互作用，从而对钙钛矿相的形成和稳定起保护作用。

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来源期刊

Journal of Electron Spectroscopy and Related Phenomena 物理-光谱学

CiteScore

3.30

自引率

5.30%

发文量

审稿时长

60 days

期刊介绍： The Journal of Electron Spectroscopy and Related Phenomena publishes experimental, theoretical and applied work in the field of electron spectroscopy and electronic structure, involving techniques which use high energy photons (>10 eV) or electrons as probes or detected particles in the investigation.