Enhancing Performance of a GaAs/AlGaAs/GaAs Nanowire Photodetector Based on the Two-Dimensional Electron-Hole Tube Structure

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

1 Scopus Citations
View graph of relations

Author(s)

  • Xiaotian Zhu
  • Fengyuan Lin
  • Zhihong Zhang
  • Xue Chen
  • Hao Huang
  • Dengkui Wang
  • Jilong Tang
  • Xuan Fang
  • Dan Fang
  • Lei Liao
  • Zhipeng Wei

Detail(s)

Original languageEnglish
Pages (from-to)2654-2659
Journal / PublicationNano Letters
Volume20
Issue number4
Online published26 Feb 2020
Publication statusPublished - 8 Apr 2020

Abstract

Here, we design and engineer an axially asymmetric GaAs/AlGaAs/GaAs (G/A/G) nanowire (NW) photodetector that operates efficiently at room temperature. Based on the I-type band structure, the device can realize a two-dimensional electron-hole tube (2DEHT) structure for the substantial performance enhancement. The 2DEHT is observed to form at the interface on both sides of GaAs/AlGaAs barriers, which constructs effective pathways for both electron and hole transport in reducing the photocarrier recombination and enhancing the device photocurrent. In particular, the G/A/G NW photodetector exhibits a responsivity of 0.57 A/W and a detectivity of 1.83 × 1010 Jones, which are about 7 times higher than those of the pure GaAs NW device. The recombination probability has also been significantly suppressed from 81.8% to 13.2% with the utilization of the 2DEHT structure. All of these can evidently demonstrate the importance of the appropriate band structure design to promote photocarrier generation, separation, and collection for high-performance optoelectronic devices.

Research Area(s)

  • AlGaAs, GaAs, nanowire, photodetector, photoresponse, two-dimensional electron-hole tube

Citation Format(s)

Enhancing Performance of a GaAs/AlGaAs/GaAs Nanowire Photodetector Based on the Two-Dimensional Electron-Hole Tube Structure. / Zhu, Xiaotian; Lin, Fengyuan; Zhang, Zhihong; Chen, Xue; Huang, Hao; Wang, Dengkui; Tang, Jilong; Fang, Xuan; Fang, Dan; Ho, Johnny C.; Liao, Lei; Wei, Zhipeng.

In: Nano Letters, Vol. 20, No. 4, 08.04.2020, p. 2654-2659.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal