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Formation of GaAs wire structures and position-controlled In_(0.8)Ga_(0.2)As quantum dots on SiO_2-patterned vicinal (001) GaAs substrates

机译:在SiO_2图案邻域(001)GaAs衬底上形成GaAs线结构和位置控制的In_(0.8)Ga_(0.2)As量子点

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摘要

We investigated In_(0.8)Ga_(0.2)As self-assembled quantum dots (SAQDs) and their underlying GaAs wire structures grown by metalorganic vapour phase epitaxy on SiO_2-patterned exact and vicinal (001) GaAs substrates. The directions of the misorientation of the vicinal (001) GaAs substrate and the patterned wire SiO_2 mask were [11_bar 1]. During the growth of the GaAs layer on SiO_2-patterned vicinal (001) GaAs substrates. {110}, {111}A, and {113}A facets were evolved by the opening layer width of the masks and the misorientation angles of the substrates. The ratio of the growth rate on the {111}A sidewalls to that on the neighbouring facets. (G_({111}A)), was increased by using the vicinal substrate having the higher misorientation angle, hence the surface migration of Ga adatoms from the {111}A sidewalls to the top region (M_(S->T)) decreased. In_(0.8)Ga_(0.2)As SAQDs having regular periodicity on a narrow (001) top terrace were formed on a SiO_2-pattemed 5 deg -off (001) GaAs substrate.
机译:我们研究了In_(0.8)Ga_(0.2)As自组装量子点(SAQDs)及其在SiO_2图案的精确和附近(001)GaAs衬底上通过金属有机气相外延生长的其下面的GaAs线结构。相邻的(001)GaAs衬底和构图的线SiO_2掩模的取向错误的方向是[11_bar 1]。在SiO_2图案的邻域(001)GaAs衬底上生长GaAs层期间。 {110},{111} A和{113} A的面通过掩模的开口层宽度和基板的取向差角而演变。 {111} A侧壁上的生长速率与相邻面上的生长速率之比。 (G _({111} A))通过使用取向角较大的邻近基底而增加,因此Ga吸附原子从{111} A侧壁到顶部区域的表面迁移(M_(S-> T))减少了。在狭窄的(001)顶部平台上具有规则周期性的In_(0.8)Ga_(0.2)As SAQD形成在SiO_2图案的5度偏移(001)GaAs衬底上。

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