Tuning the Charge Transfer Dynamics of the Nanostructured GaN Photoelectrodes for Efficient Photoelectrochemical Detection in the Ultraviolet Band

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

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Author(s)

  • Shi Fang
  • Danhao Wang
  • Xiaoning Wang
  • Xin Liu
  • Yang Kang
  • Huabin Yu
  • Haochen Zhang
  • Wei Hu
  • Haiding Sun
  • Shibing Long

Detail(s)

Original languageEnglish
Article number2103007
Number of pages9
Journal / PublicationAdvanced Functional Materials
Volume31
Issue number29
Online published7 May 2021
Publication statusPublished - 16 Jul 2021

Abstract

The intriguing surface sensitivity of the single-crystalline semiconductor nanowires offers tremendous opportunity in tuning the physical properties of nanophotonic and nanoelectronic devices for versatile applications. Particularly, in the pursuit of emerging photoelectrochemical (PEC)-type devices, significant efforts have been devoted to understanding the charge transfer dynamics between the nanowires and the electrolyte. Here, a PEC-type ultraviolet photodetector consisting of GaN p-n junction nanowires as photoelectrodes is constructed. It is found that two competing charge transport processes at the nanowires’ surface as well as in the p-n junction co-determine the photoresponsive behavior of the device. Furthermore, the surface platinum (Pt) decoration has successfully tuned the charge transfer dynamics by enhancing the charge transport efficiency at the surface, resulting in a twenty-fold increase of the photocurrent compared to the pristine GaN nanowires. Theoretical calculations reveal that the newly formed electronic states at the Pt/GaN interface account for the improved charge transfer at the surface, and the optimal hydrogen adsorption energy contributes to the boosted PEC reaction rate. The synergy of these two effects uncover the underlying mechanism of the high photoresponse of the constructed Pt/GaN-nanowires-based PEC photodetectors.

Research Area(s)

  • charge transfer dynamics, GaN nanowires, photoelectrochemical photodetectors, self-powered devices, surface decoration

Citation Format(s)

Tuning the Charge Transfer Dynamics of the Nanostructured GaN Photoelectrodes for Efficient Photoelectrochemical Detection in the Ultraviolet Band. / Fang, Shi; Wang, Danhao; Wang, Xiaoning; Liu, Xin; Kang, Yang; Yu, Huabin; Zhang, Haochen; Hu, Wei; He, Jr-Hau; Sun, Haiding; Long, Shibing.

In: Advanced Functional Materials, Vol. 31, No. 29, 2103007, 16.07.2021.

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