GaAs(001)薄膜的表面形貌相变和表面重构  

Research on relationship between morphologiesphase transition and surface reconstructions of GaAs(001)films

作　　者：刘雪飞[1] 吕兵[1] 罗子江[2] 王继红 郭祥 杨秀璋 LIU Xuefei;LV Bing;LUO Zijiang;WANG Jihong;GUO Xiang;YANG Xiuzhang(College of Physics and Electronics Science, Guizhou Normal University, Guiyang, 550025, China;College of Information, Guizhou University of Finance and Economics, Guiyang, 550025, China;College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, China)

机构地区：[1]贵州师范大学物理与电子科学学院,贵阳550025 [2]贵州财经大学信息学院,贵阳550025 [3]贵州大学大数据与信息工程学院,贵阳550025

出　　处：《功能材料》2021年第3期3098-3103,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(11664005);贵州省科技计划资助项目(黔科合基础〔2019〕1041号,黔科合基础〔2020〕1Y021,黔科合基础〔2020〕1Y279)。

摘　　要：从原子级平坦的GaAs(001)-β2(2×4)重构表面出发,结合Reflection High Energy Electron Diffraction(RHEED)衍射图像演变和不同尺度的Scanning tunneling microscope(STM)实空间扫描图像,获取GaAs(001)薄膜表面形貌相变和表面重构的重要信息,深入地研究GaAs(001)表面形貌相变和表面重构的相互促进关系。研究发现表面重构的变化是促使表面形貌发生相变的主要动力,单一表面重构组成的GaAs(001)表面形貌更容易处于有序平坦相,GaAs(001)表面预粗糙相则是由两种同类型或者重构原胞差异很小的表面重构交织混合形成,当表面由两种完全不同类型的表面重构交错混合形成时GaAs(001)表面形貌将进入粗糙状态。研究结果表明GaAs(001)表面重构是表面形貌发生相变过程的微观内在原因,而GaAs(001)表面形貌相变是表面重构发生变化的宏观外在体现。Starting with reconstructed atomic-level flat GaAs(001)-β2(2×4)surface,by combining reflection high energy electron diffraction(RHEED)diffraction and different scales of scanning tunneling microscope(STM)real space scanning images,this paper has firstly obtained critical information about the morphology transformation and reconstruction of GaAs(001)surface.Besides,the relationship between surface morphologies phase transition and surface reconstructions of GaAs(001)is further investigated.The results show that the phase transition of surface morphologies are mainly drove by the variation of surface reconstruction.The surface morphologies of GaAs(001)composed of a single surface reconstruction is more easily in an ordered flat phase.The GaAs(001)surface pre-rough phase is formed by mixing two identically or two approximately reconstructed unit cells.In contrast,surface morphologies of GaAs(001)would be in a rough phase when the surface is formed by two different types of surface reconstructions.Thus,it can be concluded that the surface reconstructions are the microscopically underlying mechanism of the surface morphologies phase transition,and the surface morphologies phase transitions are the macroscopically external manifestation of surface reconstructions.

关 键 词：GAAS(001) 形貌相变 表面重构 RHEED STM 

分 类 号：TN3[电子电信—物理电子学] O47[理学—半导体物理]