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Size and density control of In droplets at near room temperatures

机译:室温下In液滴的大小和密度控制

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We report on the ability to control the size and density of In droplets on GaAs(100) substrates at near room temperatures using solid source molecular beam epitaxy. We specifically demonstrate the height, diameter and density control of In droplets as functions of substrate temperature (T_(sub)) and monolayer (ML) coverage. For a range of density (~10~9-10~(10) cm~(-2)), the growth window is revealed to be between 20 and 70 °C. For a fixed ML coverage, the size and density of droplets can be controlled by controlling the T_(sub). For a fixed T_(sub), by controlling the ML coverage, droplet size and density can be controlled. Even at near room temperatures (20-70 °C), In atoms are extremely sensitive to surface diffusion and this enables the control of the size and density of droplets. This study provides an aid to understanding the formation of In droplets at near room temperatures and can find applications in the formation of quantum structures and/or nanostructures based on droplet epitaxy.
机译:我们报告了使用固体源分子束外延在近室温下控制GaAs(100)衬底上In液滴尺寸和密度的能力。我们具体证明了In液滴的高度,直径和密度控制与衬底温度(T_(sub))和单层(ML)覆盖率的关系。对于一定的密度范围(〜10〜9-10〜(10)cm〜(-2)),生长窗口显示为20至70°C。对于固定的ML覆盖范围,可以通过控制T_(sub)来控制液滴的大小和密度。对于固定的T_(sub),通过控制ML覆盖率,可以控制液滴的大小和密度。即使在接近室温(20-70°C)的情况下,In原子对表面扩散也非常敏感,这可以控制液滴的大小和密度。这项研究有助于理解在接近室温的情况下In液滴的形成,并可以发现在基于液滴外延的量子结构和/或纳米结构的形成中的应用。

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