The interface between Pt and Bi2Se3: Instability and formation of a new ordered phase

IF 7.5 Q1 CHEMISTRY, PHYSICAL
Mattia Fanetti, Katja Ferfolja, Sandra Gardonio, Matjaž Valant
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引用次数: 0

Abstract

In this work the interface between a Pt film and a Bi2Se3 (0001) surface is investigated using electron microscopy and microanalysis, in order to characterize the structure of the interface and verify if it is chemically stable or an interaction occurs. At room temperature, the Pt film is composed of small clusters (∼10 nm) and the interface is stable. However, already upon mild annealing (200 °C) the interface displays instability and forms an interfacial phase. The interfacial phase, not previously reported in literature, is a long-range ordered ternary Pt:Bi:Se phase aligned with the Bi2Se3 crystal, most probably an intermetallic compound. The presence of a new phase at Pt/Bi2Se3 interface, together with the possible effects on the topological surface states, has to be considered in all the applied studies where this interface is present, as well as in the models for theoretical studies.

铂与 Bi2Se3 之间的界面:不稳定性与新有序相的形成
这项研究利用电子显微镜和显微分析法对铂薄膜和 Bi2Se3 (0001) 表面之间的界面进行了研究,以确定界面结构的特征,并验证其化学性质是否稳定或是否发生了相互作用。室温下,铂膜由小团块(10 纳米)组成,界面稳定。然而,在温和退火(200 °C)时,界面就显示出不稳定性,并形成界面相。该界面相是一种与 Bi2Se3 晶体对齐的长程有序三元铂:铋:硒相,很可能是一种金属间化合物,此前未在文献中报道过。Pt/Bi2Se3 界面新相的出现,以及对拓扑表面态可能产生的影响,必须在存在该界面的所有应用研究以及理论研究模型中加以考虑。
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
CiteScore
8.10
自引率
1.60%
发文量
128
审稿时长
66 days
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