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Short-wavelength spectral response properties of semiconductor/liquid junctions

Kumar, Amit and Lewis, Nathan S. (1990) Short-wavelength spectral response properties of semiconductor/liquid junctions. Journal of Physical Chemistry, 94 (15). pp. 6002-6009. ISSN 0022-3654. doi:10.1021/j100378a070.

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We report the first measurements of photocurrent quantum yields for semiconductor/liquid junctions in the short-wavelength region of the spectrum (200-600 nm). The key feature of this wavelength region is the short penetration depth for the absorbed photon (less than 100 A), which allows measurement of the majority carrier collection velocity. Spectra have been obtained for semiconductor/liquid, semiconductor/metal, and semiconductor/insulator/metal junctions. For all semiconductors studied (n-Si, p-Si, n-GaAs, n-InP, a-Si:H), the spectral responses of the liquid junctions showed higher quantum yields than the metal junctions, indicating greater majority carrier losses at the metal junctions. This general trend was independent of redox species, solvent, supporting electrolyte, and metal overlayer. The spectral response data can also be used to distinguish Schottky barrier behavior from electrocatalytic behavior of metal overlayers, and this approach has been used to study several semiconductor/metal film junctions in contact with electrolytes.

Item Type:Article
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Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 1990 American Chemical Society. (Received: December 11, 1989) We thank the Department of Energy, Office of Basic Energy Sciences, for support of this work. We also acknowledge Mary L. Rosenbluth and Pat G. Santangelo for technical assistance with some of the experiments and for helpful discussions.
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Department of Energy (DOE)UNSPECIFIED
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Caltech Division of Chemistry and Chemical Engineering8085
Issue or Number:15
Record Number:CaltechAUTHORS:20180430-145302857
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Official Citation:Short-wavelength spectral response properties of semiconductor/liquid junctions Amit. Kumar and Nathan S. Lewis The Journal of Physical Chemistry 1990 94 (15), 6002-6009 DOI: 10.1021/j100378a070
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86140
Deposited By: George Porter
Deposited On:30 Apr 2018 22:46
Last Modified:19 Apr 2023 16:07

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