Nanometer scale fabrication and optical response of InGaN/GaN quantum disks

Yi Chun Lai, Akio Higo, Takayuki Kiba, Cedric Thomas, Shula Chen, Chang Yong Lee, Tomoyuki Tanikawa, Shigeyuki Kuboya, Ryuji Katayama, Kanako Shojiki, Junichi Takayama, Ichiro Yamashita, Akihiro Murayama, Gou Chung Chi, Peichen Yu, Seiji Samukawa

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

In this work, we demonstrate homogeneously distributed In0.3Ga0.7N/GaN quantum disks (QDs), with an average diameter below 10 nm and a high density of 2.1 ×1011 cm-2, embedded in 20 nm tall nanopillars. The scalable top-down fabrication process involves the use of self-assembled ferritin bio-templates as the etch mask, spin coated on top of a strained In0.3Ga0.7N/GaN single quantum well (SQW) structure, followed by a neutral beam etch (NBE) method. The small dimensions of the iron cores inside ferritin and nearly damage-free process enabled by the NBE jointly contribute to the observation of photoluminescence (PL) from strain-relaxed In0.3Ga0.7N/GaN QDs at 6 K. The large blueshift of the peak wavelength by over 70 nm manifests a strong reduction of the quantum-confined Stark effect (QCSE) within the QD structure, which also agrees well with the theoretical prediction using a 3D Schrödinger equation solver. The current results hence pave the way towards the realization of large-scale III-N quantum structures using the combination of bio-templates and NBE, which is vital for the development of next-generation lighting and communication devices.

Original languageEnglish
Article number425401
JournalNanotechnology
Volume27
Issue number42
DOIs
Publication statusPublished - 2016 Sep 15

Keywords

  • InGaN/GaN
  • bio-template
  • neutral beam etch
  • quantum disks
  • single quantum well

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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