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MBE Growth and Luminescence Property of GaSb Thin Film Based on GaAs
Author(s): 
Pages: 339-343
Year: Issue:  2
Journal: RARE METAL MATERIALS AND ENGINEERING

Keyword:  分子束外延GaSb缓冲层发光特性;
Abstract: 研究了用分子束外延(MBE)在GaAs衬底上生长GaSb薄膜的工艺.为了减小因晶格失配度较大所引起的位错密度,采用低温GaSb作为缓冲层,有效降低了外延层中的位错密度,提高了晶体质量.通过X射线双晶衍射仪和原子力显微镜测试分析,得到低温GaSb缓冲层的优化生长参数:厚度为20 nm,生长速率为1.43 μm/h,Ⅴ/Ⅲ束流比为2.0.并在此基础上研究了GaSb薄膜的发光特性:GaSb薄膜的光致发光光谱主要由束缚激子(BE4)和施主一受主对(D-A)辐射复合发光峰组成,在50 K时其发光峰强度最强,半峰宽最窄.
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