Suspended p-n Junction InGaN/GaN Multiple-Quantum-Well Device With Selectable Functionality

Xin Li, Gangyi Zhu, Xumin Gao, Dan Bai, Xiaoming Huang, Xun Cao, Hongbo Zhu, Kazuhiro Hane, Yongjin Wang

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We demonstrate optoelectronic devices implemented on suspended p-n junction InGaN/GaN multiple quantum wells (MQWs) for the further monolithic integration of an optical source, a waveguide, and a photodetector on the same GaN-on-silicon wafer. The fabricated suspended membrane device exhibits selectable functionalities either for efficient light-emitting diodes (LEDs) or sensitive photodetectors. Typical current-voltage (I-V) characteristics are obtained for the device operated under the LED mode, and the emitted light intensity is effectively modulated by the applied voltage. Lateral in-plane propagation of emitted light in a suspended membrane is experimentally presented. The simulation results show that the thickness-dependent optical performance can be tuned by back wafer thinning for epitaxial films. The device operated under the photodetector mode exhibits a static photocurrent on-off ratio ηs of 2.25 × 105 at a 1-V bias voltage with the illumination power of 690 μW and the wavelength of 450 nm. The photocurrent also shows a rectangular pulse response of the same duration as a 1-s rectangular illumination pulse at a 0-V bias voltage with the illumination power of 1 mW. The temporal photocurrent on-off ratio ηt is around 1.01 × 105. This paper opens a promising way to realize the monolithic integration of a LED, a waveguide, and a photodetector on a GaN-on-silicon platform.

Original languageEnglish
Article number7323797
JournalIEEE Photonics Journal
Volume7
Issue number6
DOIs
Publication statusPublished - 2015 Dec

Keywords

  • Light-emitting diodes
  • Photodetector
  • Thin film devices and applications

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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