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Title: Charge transfer in photoelectrochemical devices via interface states - unified model and comparison with experimental data

Abstract

A simple, unified model is presented for the mediation of charge transfer across the semiconductor/electrolyte interface by states localized in the bandgap of the semiconductor. These states are interpreted to arise from specific adsorption of anionic species from the electrolyte. The adsorbed ions could be either one of the components of a regenerative redox couple or comprise the constituent ions of the supporting electrolyte. The role of the interphasial layer in photoelectrochemical (PEC) devices is examined in the light of the above model. The key factor in determining the efficacy of energy conversion in the PEC system is identified as the competition between tunneling of photogenerated holes across the interphasial layer and their recombination with the majority carriers in the semiconductor conduction band. The extent of matching between the interface state and the reduced (filled) energy levels in the electrolyte is shown to be important in this regard. Experimental data on the n-GaAs/room temperature molten salt electrolyte and the n-CdSe/polysulfide interfaces are discussed in the light of this model. 28 refs.

Authors:
Publication Date:
Research Org.:
Colo State Univ, Fort Collins, USA
OSTI Identifier:
6679194
Resource Type:
Journal Article
Journal Name:
J. Electrochem. Soc.; (United States)
Additional Journal Information:
Journal Volume: 129:5
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; PHOTOELECTROCHEMICAL CELLS; CHARGED-PARTICLE TRANSPORT; MATHEMATICAL MODELS; ADSORPTION; CADMIUM SELENIDES; ELECTROLYTES; ENERGY LEVELS; GALLIUM ARSENIDES; INDIUM PHOSPHIDES; INTERFACES; MOLTEN SALTS; RECOMBINATION; SEMICONDUCTOR MATERIALS; SILICON; TUNNELING; ARSENIC COMPOUNDS; ARSENIDES; CADMIUM COMPOUNDS; CHALCOGENIDES; ELECTROCHEMICAL CELLS; ELEMENTS; EQUIPMENT; GALLIUM COMPOUNDS; INDIUM COMPOUNDS; MATERIALS; PHOSPHIDES; PHOSPHORUS COMPOUNDS; PNICTIDES; RADIATION TRANSPORT; SALTS; SELENIDES; SELENIUM COMPOUNDS; SEMIMETALS; SOLAR EQUIPMENT; SORPTION; 140505* - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-)

Citation Formats

Rajeshwar, K. Charge transfer in photoelectrochemical devices via interface states - unified model and comparison with experimental data. United States: N. p., 1982. Web. doi:10.1149/1.2123999.
Rajeshwar, K. Charge transfer in photoelectrochemical devices via interface states - unified model and comparison with experimental data. United States. doi:10.1149/1.2123999.
Rajeshwar, K. Sat . "Charge transfer in photoelectrochemical devices via interface states - unified model and comparison with experimental data". United States. doi:10.1149/1.2123999.
@article{osti_6679194,
title = {Charge transfer in photoelectrochemical devices via interface states - unified model and comparison with experimental data},
author = {Rajeshwar, K},
abstractNote = {A simple, unified model is presented for the mediation of charge transfer across the semiconductor/electrolyte interface by states localized in the bandgap of the semiconductor. These states are interpreted to arise from specific adsorption of anionic species from the electrolyte. The adsorbed ions could be either one of the components of a regenerative redox couple or comprise the constituent ions of the supporting electrolyte. The role of the interphasial layer in photoelectrochemical (PEC) devices is examined in the light of the above model. The key factor in determining the efficacy of energy conversion in the PEC system is identified as the competition between tunneling of photogenerated holes across the interphasial layer and their recombination with the majority carriers in the semiconductor conduction band. The extent of matching between the interface state and the reduced (filled) energy levels in the electrolyte is shown to be important in this regard. Experimental data on the n-GaAs/room temperature molten salt electrolyte and the n-CdSe/polysulfide interfaces are discussed in the light of this model. 28 refs.},
doi = {10.1149/1.2123999},
journal = {J. Electrochem. Soc.; (United States)},
number = ,
volume = 129:5,
place = {United States},
year = {1982},
month = {5}
}