期刊
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
卷 265, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.elspec.2023.147330
关键词
STXM; Ptychography; Sn-based perovskite; EMITFSI; Ionic liquid
类别
The structural and compositional properties of tin halide perovskites were investigated using scanning transmission soft X-ray microscopy (STXM) and spectro-ptychography techniques. The study revealed the spectral characteristics of main components in Sn-based perovskites and differences between samples with and without adding an ionic liquid. Chemical imaging showed that the ionic liquid-treated sample exhibited a more homogeneous perovskite phase, and XANES resonance features supported the protective role of the ionic liquid in perovskite formation and stabilization.
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,M-4-edge, I M-5,M-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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