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原子氢辅助分子束外延生长台阶状表面形貌的研究

Step-Like Morphology Surfaces Formed by Atomic Hydrogen Assisted Molecular Beam Epitaxy
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摘要 研究了分子束外延中引入原子氢后 ,原子氢对外延层表面形貌特征形成的诱导作用 .原子力显微镜 (AFM)测试表明 ,在 (311) A Ga As表面 ,原子氢导致了台阶状形貌的形成 ,在这种台阶状表面进一步生长了 In As量子点 ,测试结果表明其位置分布的有序化受到台阶高度和台阶周期的制约 .这为实现量子点结构的有序化控制生长提供了一定的实验参考 . The effects of atomic hydrogen on surface morphology of epitaxial layers grown by molecular beam epitaxy are investigated.AFM pictures show that atomic hydrogen leads to the formation of step bunching on (311)A GaAs surface.The sites distribution of InAs quantum dots (QDs) grown on this step like morphology surfaces is slightly positioned by the steps of the surfaces.All these results give useful experimental references to the site controlled growth of QDs.
出处 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2003年第2期148-152,共5页 半导体学报(英文版)
基金 国家自然科学基金 (批准号 :60 1760 0 6 60 0 2 5 410 ) 中国科学院纳米科学技术资助项目~~
关键词 原子氢 表面形貌 分子束外延 原子力显微镜 台阶积累 量子点 MBE AFM step bunching quantum dots
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参考文献11

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