Abstract
We report on various self-assembled In(Ga)As nanostructures by droplet epitaxy on GaAs substrates using molecular beam epitaxy. Depending on the growth condition and index of surfaces, various nanostructures can be fabricated: quantum dots (QDs), ring-like and holed-triangular nanostructures. At near room temperatures, by limiting surface diffusion of adatoms, the size of In droplets suitable for quantum confinement can be fabricated and thus InAs QDs are demonstrated on GaAs (100) surface. On the other hand, at relatively higher substrate temperatures, by enhancing the surface migrations of In adatoms, super lower density of InGaAs ring-shaped nanostructures can be fabricated on GaAs (100). Under an identical growth condition, holed-triangular InGaAs nanostructures can be fabricated on GaAs type-A surfaces, while ring-shaped nanostructures are formed on GaAs (100). The formation mechanism of various nanostructures can be understood in terms of intermixing, surface diffusion, and surface reconstruction.
Highlights
Owing to their unique optoelectronic, and physical properties, self-assembled semiconductor quantum- and nanostructures have been the focus of rigorous research efforts in basic physics [1,2,3,4,5] and solid-state devices
We report on various self-assembled In(Ga)As nanostructures by droplet epitaxy on GaAs substrates using molecular beam epitaxy
In terms of the growth mechanism, a simple scheme described in Fig. 1f, g can be used for InAs quantum dots (QDs) as they are just converted from droplets into nano-crystalline semiconductors and the surface diffusion and the intermixing was kept at a minimum by a relatively low Tsub and background pressure recovery [37]
Summary
Owing to their unique optoelectronic, and physical properties, self-assembled semiconductor quantum- and nanostructures have been the focus of rigorous research efforts in basic physics [1,2,3,4,5] and solid-state devices. Depending on the growth condition and index of surfaces, various nanostructures can be fabricated: quantum dots (QDs), ring-like and holed-triangular nanostructures.
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