title: Quantum size effects in GaAs nanodisks fabricated using a combination of the bio-template technique and neutral beam etching.
abstract: We successfully fabricated defect-free, distributed and sub-20-nm GaAs quantum dots (named GaAs nanodisks (NDs)) by using a novel top-down technique that combines a new bio-template (PEGylated ferritin) and defect-free neutral beam etching (NBE). Greater flexibility was achieved when engineering the quantum levels of ND structures resulted in greater flexibility than that for a conventional quantum dot structure because structures enabled independent control of thickness and diameter parameters. The ND height was controlled by adjusting the deposition thickness, while the ND diameter was controlled by adjusting the hydrogen-radical treatment conditions prior to NBE. Photoluminescence emission due to carrier recombination between the ground states of GaAs NDs was observed, which showed that the emission energy shift depended on the ND diameters. Quantum level engineering due to both diameter and thickness was verified from the good agreement between the PL emission energy and the calculated quantum confinement energy.
authors.affiliation: Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Tamura
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kaizu
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kiba
authors.forename: Makoto
authors.initials: M
authors.lastname: Igarashi
authors.forename: Rikako
authors.initials: R
authors.lastname: Tsukamoto
authors.forename: Akio
authors.initials: A
authors.lastname: Higo
authors.forename: Weiguo
authors.initials: W
authors.lastname: Hu
authors.forename: Cedric
authors.initials: C
authors.lastname: Thomas
authors.forename: Mohd Erman
authors.initials: ME
authors.lastname: Fauzi
authors.forename: Takuya
authors.initials: T
authors.lastname: Hoshii
authors.forename: Ichiro
authors.initials: I
authors.lastname: Yamashita
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Okada
authors.forename: Akihiro
authors.initials: A
authors.lastname: Murayama
authors.forename: Seiji
authors.initials: S
authors.lastname: Samukawa
mesh_terms: D001152:Arsenicals / Q000737:chemistry*; D001709:Biotechnology / Q000379:methods; D005293:Ferritins / Q000737:chemistry; D005708:Gallium / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry; D045663:Quantum Dots
chemical_list: D001152:Arsenicals; C043055:gallium arsenide; D011092:Polyethylene Glycols; D005293:Ferritins; D005708:Gallium