Jump to main content
Jump to site search


Photoelectrochemical hydrogen generation from water using undoped GaN with selective-area Si-implanted stripes as photoelectrodes

Abstract

This study examines photoelectrochemical (PEC) cells with undoped GaN (u-GaN) photoelectrodes that feature selective-area Si implantation stripes for hydrogen (H2) generation using NaCl solution as electrolyte. Selective-area Si implantation was performed on the u-GaN layer to create n+-GaN stripes with higher carrier concentration than the u-GaN area. Si-implanted n+-GaN stripes behave like metal lines, but they allow light to penetrate Si-implanted regions, to facilitate the collection of photogenerated carriers. For a moderate area ratio of Si implantation, the typical hydrogen generation rate of u-GaN working electrodes with and without Si-implanted GaN stripes were approximately 98 mole/hrcm2 and 68 mole/hrcm2, respectively, when the applied potential was 1 V. These values correspond to an enhanced H2 generation rate of around 44%. The marked enhancement in hydrogen generation rate is attributed to the fact that photogenerated electrons can be effectively collected by Si-implanted n+-GaN stripes. Microscopy showed an insignificant change in Si-implanted surfaces before and after PEC reaction. By contrast, u-GaN area without Si implantation exhibited significant corrosion after PEC reaction. The findings of this study indicate that the u-GaN epitaxial layer with Si-implanted stripes can be potentially used as robust photoelectrodes to efficiently generate hydrogen.

Back to tab navigation

Publication details

The article was received on 14 Aug 2017, accepted on 03 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07155H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    Photoelectrochemical hydrogen generation from water using undoped GaN with selective-area Si-implanted stripes as photoelectrodes

    J. Sheu, P. H. Liao, H. Cheng and M. Lee, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07155H

Search articles by author

Spotlight

Advertisements