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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S5 — Sep. 10, 2012
  • pp: A678–A683

Mn-doped GaN as photoelectrodes for the photoelectrolysis of water under visible light

Shu-Yen Liu, J. K. Sheu, Yu-Chuan Lin, S. J. Tu, F. W. Huang, M. L. Lee, and W. C. Lai  »View Author Affiliations


Optics Express, Vol. 20, Issue S5, pp. A678-A683 (2012)
http://dx.doi.org/10.1364/OE.20.00A678


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Abstract

Hydrogen generation through direct photoelectrolysis of water was studied using photoelectrochemical (PEC) cells made of Mn-doped GaN photoelectrodes. In addition to its absorption of the ultraviolet spectrum, Mn-doped GaN photoelectrodes could absorb photons in the visible spectrum. The photocurrents measured from PEC cells made of Mn-doped GaN were at least one order higher than those measured from PEC cells made of undoped GaN-working electrodes. Under the visible light illumination and a bias voltage below 1.2 V, the Mn-doped GaN photoelectrodes could drive the water splitting reaction for hydrogen generation. However, hydrogen generation could not be achieved under the same condition wherein undoped GaN photoelectrodes were used. According to the results of the spectral responses and transmission spectra obtained from the experimental photoelectrodes, the enhanced photocurrent in the Mn-doped GaN photoelectrodes, compared with the undoped GaN photoelectrodes, was attributable to the Mn-related intermediate band within the band gap of GaN that resulted in further photon absorption.

© 2012 OSA

OCIS Codes
(310.3840) Thin films : Materials and process characterization
(310.4925) Thin films : Other properties (stress, chemical, etc.)
(310.6845) Thin films : Thin film devices and applications

ToC Category:
Solar Fuel

History
Original Manuscript: May 31, 2012
Revised Manuscript: July 31, 2012
Manuscript Accepted: July 31, 2012
Published: August 3, 2012

Citation
Shu-Yen Liu, J. K. Sheu, Yu-Chuan Lin, S. J. Tu, F. W. Huang, M. L. Lee, and W. C. Lai, "Mn-doped GaN as photoelectrodes for the photoelectrolysis of water under visible light," Opt. Express 20, A678-A683 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-S5-A678


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