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n-type GaAs photoanodes in acetonitrile: Design of a 10.0% efficient photoelectrode

Gronet, Chris M. and Lewis, Nathan S. (1983) n-type GaAs photoanodes in acetonitrile: Design of a 10.0% efficient photoelectrode. Applied Physics Letters, 43 (1). pp. 115-117. ISSN 0003-6951. doi:10.1063/1.94148.

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n-type GaAs semiconductor/liquid junctions have been studied in acetonitrile (ACN) solvent with the ferrocene/ferricenium redox couple. Previously reported inefficiencies in this system are demonstrated to be due to bulk electron-hole recombination and not to recombination at the junction. Increases in minority-carrier collection length lead to increases in short circuit current of the n-GaAs/ferrocene/ferricenium cell in ACN, with photocurrent densities in excess of 21 mA/cm^2 at 88 mW/cm^2 of ELH-type tungsten-halogen irradiation. Properly prepared n-GaAs samples yield photoelectrode efficiencies of 10.0%±0.5% for conversion of natural sunlight (65 mW/cm^2) to electricity, with open circuit voltages Voc of 0.70–0.72 V, short circuit currents of 16–17 mA/cm^2, and fill factors of 0.52–0.56, when measured relative to the potential of a reversible reference electrode in the same solvent/redox couple/electrolyte solution.

Item Type:Article
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Lewis, Nathan S.0000-0001-5245-0538
Additional Information:Copyright © 1983 American Institute of Physics. Received 10 January 1983; accepted 13 April 1983. We thank G. Cogan, J. Gibbons, and G. Moddel of SERA Corp., Santa Clara, CA for many helpful discussions and for the use of evaporation facilities.
Subject Keywords:gallium arsenide solar cells, photoanodes, n−type conductors, nitriles, organic compounds, efficiency, electrodes, radiation effects, liquids, junctions, ferrocene, redox reactions, electron−hole coupling, recombination, charge carriers, length, electric currents, current density, electrolytes
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Record Number:CaltechAUTHORS:GROapl83
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10317
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Deposited On:23 Apr 2008
Last Modified:08 Nov 2021 21:06

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