Junctions in Axial III−V Heterostructure Nanowires Obtained via an Interchange of Group III Elements

Abstract

We present an investigation of the morphology and composition of novel types of axial nanowire heterostructures where Ga(x)In(1-x)As is used as barrier material in InAs nanowires. Using aberration-corrected scanning transmission electron microscopy and energy dispersive X-ray analysis we demonstrate that it is possible to grow junctions by changing the group III elements, and we find that a substantial fraction of Ga can be incorporated in axial InAs/Ga(x)In(1-x)As/InAs, retaining straight nanowire configurations. We explain how the adatoms are transferred to the incorporation site at the growth interface via two different routes, (1) interface diffusion and (2) volume diffusion through the catalyst particle.

On the growth of InAs nanowires by molecular beam epitaxy

“…[3] and that the T g , 423 1C, used in Ref. [21] for Au-catalyzed InAs NWs lies within the range given above.…”

Direct observation of interface and nanoscale compositional modulation in ternary III-As heterostructure nanowires

“…Maintaining a Ga concentration corresponding to x $ 0.35 in each Ga x In 1Àx As segment ensures a high fraction of straight axially grown nanowires. 24,25 The wires predominantly exhibits the hexagonal wurtzite (WZ) structure and the preferential growth direction is along the hexagonal closed packed [0001] WZ as inferred from electron diffraction data shown in Figure 2(b). 23,[26][27][28] Our analysis of the multiple Ga Ga x In 1Àx As/InAs interface in Z-contrast HAADF-STEM imaging as shown in Figure 1(b).…”

Brief Review of Epitaxy and Emission Properties of GaSb and Related Semiconductors

“…More supersaturated elements are precipitated out and this leads to the NW growth. This process is influenced by the substrate, the growth temperature, the catalyst, the V/III flux ratio and the flux types used [75][76][77][78]. These factors thus jointly affect the physical dimensions and the crystal quality of the resulting NWs.…”