title: Influence of nanowire density on the shape and optical properties of ternary InGaAs nanowires.
abstract: We have synthesized ternary InGaAs nanowires on (111)B GaAs surfaces by metal-organic chemical vapor deposition. Au colloidal nanoparticles were employed to catalyze nanowire growth. We observed the strong influence of nanowire density on nanowire height, tapering, and base shape specific to the nanowires with high In composition. This dependency was attributed to the large difference of diffusion length on (111)B surfaces between In and Ga reaction species, with In being the more mobile species. Energy dispersive X-ray spectroscopy analysis together with high-resolution electron microscopy study of individual InGaAs nanowires shows large In/Ga compositional variation along the nanowire supporting the present diffusion model. Photoluminescence spectra exhibit a red shift with decreasing nanowire density due to the higher degree of In incorporation in more sparsely distributed InGaAs nanowires.
authors.affiliation: Department of Electronic Materials Engineering, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, Australia.
authors.forename: Yong
authors.initials: Y
authors.lastname: Kim
authors.forename: Hannah J
authors.initials: HJ
authors.lastname: Joyce
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.forename: H Hoe
authors.initials: HH
authors.lastname: Tan
authors.forename: Chennupati
authors.initials: C
authors.lastname: Jagadish
authors.forename: Mohanchand
authors.initials: M
authors.lastname: Paladugu
authors.forename: Jin
authors.initials: J
authors.lastname: Zou
authors.forename: Alexandra A
authors.initials: AA
authors.lastname: Suvorova
mesh_terms: D001152:Arsenicals / Q000737:chemistry* / Q000528:radiation effects; D003460:Crystallization / Q000379:methods*; D005708:Gallium / Q000737:chemistry* / Q000528:radiation effects; D007204:Indium / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D008163:Luminescent Measurements; D008422:Materials Testing; D008968:Molecular Conformation; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D055095:Optics and Photonics; D010316:Particle Size
chemical_list: D001152:Arsenicals; D007204:Indium; C043055:gallium arsenide; D005708:Gallium; C076773:indium arsenide