Coordination chemistry of semiconductor photoelectrodes: reactions of etched n-gallium arsenide with cobalt(III) complexes
Abstract
We report studies of the reactivity of n-GaAs surfaces with transition-metal complexes. Generally, adsorption of metal ions at semiconductor junctions has been observed to increase carrier trapping rates. A notable exception is the improved performance of n-GaAs interfaces after exposure to acidic aqueous solutions of Ru(III) ions and other metal cations, but little information is available regarding the chemistry of these surface treatments. Except for systems in which metal ions act as precursors for the deposition of metals or metal alloys, no information is available regarding the oxidation state or chemical environment of chemisorbed transition-metal complexes on semiconductor electrodes. Possible but undocumented mechanisms of metal ion attachment to the semiconductor surface include electrostatic binding, ligand substitution processes, and redox reactions. To explore the various possible modes of reaction, we have investigated the chemistry of n-GaAs surfaces in contact with aqueous solutions of Co(III) complexes.
Additional Information
© 1987 American Chemical Society. We acknowledge support from the National Science Foundation, CHE-12692, for this work. N.S.L. acknowledges support under the Presidential Young Investigator program (CHE-8352151) with matching funds from Monsanto, Exxon, Mobil, Sohio, and IBM. N.S.L. also acknowledges support as a Dreyfus Teacher-Scholar and an Alfred P. Sloan Foundation Fellow. We thank R. Dominguez and C. M. Gronet for assistance with some of the experiments in this study and Dr. C. R. Lewis of Varían Associates, Palo Alto, CA, for a generous supply of GaAs.Additional details
- Alternative title
- Coordination Chemistry of Semiconductor Photoelectrodes: Reactions of Etched n-GaAs with Co(III) Complexes
- Eprint ID
- 120952
- Resolver ID
- CaltechAUTHORS:20230418-571291000.10
- NSF
- CHE-12692
- NSF
- CHE-8352151
- Monsanto Corporation
- Exxon Education Foundation
- Mobil Oil Corporation
- Sohio
- IBM
- Camille and Henry Dreyfus Foundation
- Alfred P. Sloan Foundation
- Created
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2023-04-22Created from EPrint's datestamp field
- Updated
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2023-04-22Created from EPrint's last_modified field