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Electrolytic decomposition and photodecomposition of compound semiconductors in contact with electrolytes

Gerischer, Heinz (1978) Electrolytic decomposition and photodecomposition of compound semiconductors in contact with electrolytes. Journal of Vacuum Science and Technology, 15 (4). pp. 1422-1428. ISSN 0022-5355. https://resolver.caltech.edu/CaltechAUTHORS:20120727-153347692

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Abstract

Electrons and holes affect the bond strength of surface atoms. Therefore, in most systems their surface concentration controls the rate of electrolytic decomposition reactions. The thermodynamics of such reactions are characterized by their redox potentials which are equivalent to the Fermi energies of electrons or holes. It is shown that the energy positions of the redox Fermi levels for decomposition with respect to the position of the band edges and the Fermi levels of competing redox reactions, give an immediate indication for the susceptibility of a semiconductor to electrolytic decomposition. This concept is especially useful for the discussion of photodecomposition where the electronic free energy can be described by individual quasi‐Fermi levels for electrons and holes. Data are given for the semiconductors ZnO, TiO_2, Cu_2O, CdS, MoS_2, GaP, and GaAs. A model for bond breaking by holes at a kink site of a compound semiconductor is discussed to demonstrate what role the surface bond character plays for the height of activation barriers and how kinetics modify the thermodynamic conclusions on stability.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1116/1.569800DOIUNSPECIFIED
http://avspublications.org/jvst/resource/1/jvstal/v15/i4/p1422_s1PublisherUNSPECIFIED
Additional Information:© 1978 American Vacuum Society. Received 20 February 1978; accepted 24 February 1978. I want to express my gratitude for a stimulating stay at the California Institute of Technology as a Sherman Fairchild Distinguished Scholar. I am also indebted to Dr. John Turner for a very helpful discussion of the manuscript. On leave from the Fritz Haber Institut der Max Planck Gesellschaft, Berlin, Germany
Issue or Number:4
Classification Code:PACS: 82.45. + z, 82.65.Dp, 73.40.Mr, 82.45.-h, 68.35.Md
Record Number:CaltechAUTHORS:20120727-153347692
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120727-153347692
Official Citation: Electrolytic decomposition and photodecomposition of compound semiconductors in contact with electrolytes Heinz Gerischer J. Vac. Sci. Technol. 15, 1422 (1978); http://dx.doi.org/10.1116/1.569800
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32775
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:30 Jul 2012 14:50
Last Modified:03 Oct 2019 04:03

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