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Photoelectrochemical Conditioning of MOVPE p-InP Films for Light-Induced Hydrogen Evolution: Chemical, Electronic and Optical Properties

Muñoz, A. G. and Heine, C. and Lublow, M. and Klemm, H. W. and Szabό, N. and Hannappel, T. and Lewerenz, H.-J. (2013) Photoelectrochemical Conditioning of MOVPE p-InP Films for Light-Induced Hydrogen Evolution: Chemical, Electronic and Optical Properties. ECS Journal of Solid State Science and Technology, 2 (4). Q51-Q58. ISSN 2162-8769. doi:10.1149/2.016304jss.

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Homoepitaxial p-InP(100) thin films prepared by MOVPE (metallorganic vapor phase epitaxy) were transformed into an InP/oxide-phosphate/Rh heterostructure by photoelectrochemical conditioning. Surface sensitive synchrotron radiation photoelectron spectroscopy indicates the formation of a mixed oxide constituted by In(PO_3)_3, InPO_4 and In_(2)O_3 as nominal components during photo-electrochemical activation. The operation of these films as hydrogen evolving photocathode proved a light-to-chemical energy conversion efficiency of 14.5%. Surface activation arises from a shift of the semiconductor electron affinity by 0.44 eV by formation of In-Cl interfacial dipoles with a density of about 10^(12) cm^(−2). Predominant local In2O3-like structures in the oxide introduce resonance states near the semiconductor conduction band edge imparting electron conductivity to the phosphate matrix. Surface reflectance investigations indicate an enhanced light-coupling in the layered architecture.

Item Type:Article
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URLURL TypeDescription
Hannappel, T.0000-0002-6307-9831
Lewerenz, H.-J.0000-0001-8433-9471
Additional Information:© 2013 The Electrochemical Society. Manuscript submitted January 3, 2013; revised manuscript received January 22, 2013. Published February 8, 2013. The authors acknowledge the support given by the Collaborating Research Group (CRG), whichmaintains the SoLiAS system at Bessy II. Financial support was given by the BMBF federal project No. 03 SF 0353A-E which is greatly acknowledged.
Funding AgencyGrant Number
Collaborating Research Group (CRG)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)03 SF 0353A-E
Issue or Number:4
Record Number:CaltechAUTHORS:20130709-110434578
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39271
Deposited On:10 Jul 2013 14:37
Last Modified:09 Nov 2021 23:43

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