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Analysis of time-resolved photocurrent transients at semiconductor/liquid interfaces

Kenyon, C. N. and Ryba, Gail N. and Lewis, Nathan S. (1993) Analysis of time-resolved photocurrent transients at semiconductor/liquid interfaces. Journal of Physical Chemistry, 97 (49). pp. 12928-12936. ISSN 0022-3654. doi:10.1021/j100151a048.

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Small signal photocurrent transients have been measured for n-Si/CH_3OH-Me_2Fc^(+/0)/Pt, n-Si/Au/CH_3OH-Me_2Fc^(+/0)/Pt, n-Si/Pt/NaOH(aq)/Ni(OH)_2/Ni, n-TiO_2/NaOH(aq)/Ni(OH)_2/Ni, and n-TiO_2/NaOH(aq)-Fe(CN)_6^(3-/4-)/Pt cells. Even though the radio-frequency and microwave conductivity signals for photoexcited n-Si/CH_3OH-Me_2Fc^(+/0) contacts persist for > 100 µs, the photocurrent transients for these interfaces decayed in <10 µs and were limited by the series resistance of the cell in combination with the space-charge capacitance of the semiconductor. An equivalent circuit model is presented and physically justified in order to explain this behavior. The model is also used to elucidate the conditions under which photocurrent transients at semiconductor electrodes can be expected to yield information regarding the faradaic charge-transfer rate across the semiconductor/liquid interface.

Item Type:Article
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Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 1993 American Chemical Society. Received: August 25, 1993. We are indebted to Dr. S. Gottesfeld of Los Alamos National Laboratory and Dr. S. Feldberg of Brookhaven National Laboratory for invaluable discussions regarding the equivalent circuit models discussed herein, Dr. J. R. Winkler for his assistance with the data collection and analysis programs, Prof. H. Martel of Caltech for aid in the circuit analysis, and Profs. H. Gerischer and F. Anson for several helpful discussions regarding this work. We also acknowledge the Department of Energy, Office of Basic Energy Sciences, for their generous support of this work.
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Department of Energy (DOE)UNSPECIFIED
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Division of Chemistry and Chemical Engineering8852
Issue or Number:49
Record Number:CaltechAUTHORS:20180601-144522043
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Official Citation:Analysis of time-resolved photocurrent transients at semiconductor/liquid interfaces C. N. Kenyon, Gail N. Ryba, and Nathan S. Lewis The Journal of Physical Chemistry 1993 97 (49), 12928-12936 DOI: 10.1021/j100151a048
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86753
Deposited By: George Porter
Deposited On:01 Jun 2018 22:42
Last Modified:15 Nov 2021 20:41

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