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PbTe(111)薄膜的分子束外延生长及其表面结构特性  ( SCI-EXPANDED收录)  

Molecular Beam Epitaxy Growth and Surface Structural Characteristics of Pb Te(111) Thin Film

文献类型:期刊文献

中文题名:PbTe(111)薄膜的分子束外延生长及其表面结构特性

英文题名:Molecular Beam Epitaxy Growth and Surface Structural Characteristics of Pb Te(111) Thin Film

作者:吴海飞[1];陈耀[1];徐珊瑚[1];鄢永红[1];斯剑霄[2];谭永胜[1]

机构:[1]绍兴文理学院物理系;[2]浙江师范大学数理与信息工程学院

年份:2017

卷号:33

期号:2

起止页码:419

中文期刊名:物理化学学报

外文期刊名:Acta Physico-Chimica Sinica

收录:SCI-EXPANDED(收录号:WOS:000394735200017)、CSTPCD、、北大核心2014、Scopus(收录号:2-s2.0-85009742495)、WOS、CSCD2017_2018、北大核心、CSCD、PubMed

基金:The project was supported by the National Natural Science Foundation of China (51202149, 51302248, 11575116, 61405118).

语种:中文

中文关键词:表面重构;DFT;RHEED;转动对称性;PbTe薄膜

外文关键词:Surface reconstruction; DFT; RHEED; Rotational symmetry; PbTe thin film

中文摘要:采用分子束外延(MBE)方法在Ba F_2(111)衬底上直接外延生长了Pb Te薄膜。反射高能电子衍射(RHEED)实时监控的衍射图样揭示了Pb Te在Ba F_2(111)表面由三维生长向二维生长的变化过程。转动对称性的研究结合第一性原理密度泛函理论(DFT)的计算揭示了在富Pb及衬底温度(Tsub)为350°C的生长条件下,得到的Pb Te(111)薄膜具有稳定的(2×1)重构表面。Pb Te(111)-(2×1)表面覆盖Te膜后,通过300°C的退火处理,重构表面可完全复原,这为大气环境下Pb Te薄膜表面结构的保护提供了有效的方法。

外文摘要:PbTe thin films were epitaxially grown on BaF2(111) substrate using molecular beam epitaxy (MBE). In situ characterization by reflection high energy electron diffraction (RHEED) revealed a transition of the growth mode from 3D to 2D. Rotational symmetry studies combined with first principles density functional theory (DFT) calculations revealed that under Pb-rich and 350℃ substrate temperature (Tsub) growth conditions, stable (2×1) reconstructions appear on the PbTe(111) surface. When the surface of PbTe(111)-(2×1) was covered with Te, the stable (2×1) reconstructions could be retrieved under 300℃ annealing. This provides an effective method for the protection of PbTe film surfaces from the atmospheric environment.

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