The effects of surface energetics and surface oxide layers on the cyclic voltammetry of metallocenes at nonilluminated p-InP electrodes
Electron-transfer processes at highly doped p-InP electrodes were investigated by monitoring the cyclic voltammetric dark currents of a series of metallocenes in acetonitrile solutions. The formal reduction potentials of the metallocenes span the bandgap of InP, allowing a comparison of the cyclic voltammetric response as a function of the formal reduction potential and the energetic condition of the electrode surface. Since the electro transfer of all of the metallocenes was electrochemically reversible on the timescale of cyclic voltammetry at a platinum electrode, differences in the voltammetric responses at p-InP were attributed to processes within the semiconductor or to surface phenomena. The energetic condition of the electrode surface during the cyclic voltammetric experiment was monitored by measurements of the capacitance of the space-charge region. Although a simple chemical etching and electrochemical cycling procedure yielded reproducible surface energetics, the p-InP/oxide/CH/sub 3/CN interface responded ideally to changes in electrode potential over a range of only about 0.8V. Metallocene redox couples with E/sup 0/' located within that range exhibited reversible cyclic voltammetry when the experiment was performed within that range. The couples with E/sup 0/' located outside of the ideal range displayed irreversible cyclic voltammetry. Voltammetric responses for p-InP electrodes with different crystal orientations and doping densities were compared.
- Research Organization:
- Department of Chemistry, University of Colorado, Boulder, Colorado
- OSTI ID:
- 5077898
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 132:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
INDIUM PHOSPHIDES
ELECTRON TRANSFER
SURFACE ENERGY
ORGANOMETALLIC COMPOUNDS
VOLTAMETRY
ACETONITRILE
CRYSTAL DOPING
CYANIDES
DOPED MATERIALS
ELECTROCHEMISTRY
ELECTRODES
ETCHING
LAYERS
OXIDES
P-TYPE CONDUCTORS
PHOTOCURRENTS
REDOX POTENTIAL
CHALCOGENIDES
CHEMISTRY
CURRENTS
ELECTRIC CURRENTS
ENERGY
FREE ENERGY
INDIUM COMPOUNDS
MATERIALS
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SEMICONDUCTOR MATERIALS
SURFACE FINISHING
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
360603* - Materials- Properties
400400 - Electrochemistry