Photocurrent Spectroscopy of Lattice-Matched Superlattice Electrodes in Photoelectrochemical Cells

A. J. Nozik; B. R. Thacker; J. A. Turner; J. Klem; H. Morkoç

doi:10.1063/1.98118

Photocurrent Spectroscopy of Lattice-Matched Superlattice Electrodes in Photoelectrochemical Cells

A. J. Nozik, B. R. Thacker, J. A. Turner, J. Klem, H. Morkoç

Chemistry and Nanoscience

Research output: Contribution to journal › Article › peer-review

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Abstract

Photocurrent spectra of GaAs/Al_0.38Ga_0.62As lattice-matched superlattice electrodes were obtained in photoelectrochemical cells containing nonaqueous liquid electrolyte; spectra were compared for two electron acceptors, cobalticinium and ferrocinium, having redox potentials (energy levels) that differ by 1.33 V. The spectra were found to be independent of acceptor energy levels, in sharp contrast to previous results with GaAs/GaAs_0.5P_0.5As strained-layer superlattices. These results indicate that for lattice-matched systems hot-electron transfer from upper quantum states in the quantum wells is not a dominant process. This is explained by the much lower surface trapping rates in lattice-matched superlattices compared to strained-layer superlattices.

Original language	American English
Pages (from-to)	34-36
Number of pages	3
Journal	Applied Physics Letters
Volume	50
Issue number	1
DOIs	https://doi.org/10.1063/1.98118 https://doi.org/10.1063/1.98118
State	Published - 1987

Bibliographical note

Work performed by Solar Energy Research Institute, Golden, Colorado, and Coordinated Science Laboratory, University of Illinois, Urbana, Illinois

NREL Publication Number

ACNR/JA-236-8945

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title = "Photocurrent Spectroscopy of Lattice-Matched Superlattice Electrodes in Photoelectrochemical Cells",

abstract = "Photocurrent spectra of GaAs/Al0.38Ga0.62As lattice-matched superlattice electrodes were obtained in photoelectrochemical cells containing nonaqueous liquid electrolyte; spectra were compared for two electron acceptors, cobalticinium and ferrocinium, having redox potentials (energy levels) that differ by 1.33 V. The spectra were found to be independent of acceptor energy levels, in sharp contrast to previous results with GaAs/GaAs0.5P0.5As strained-layer superlattices. These results indicate that for lattice-matched systems hot-electron transfer from upper quantum states in the quantum wells is not a dominant process. This is explained by the much lower surface trapping rates in lattice-matched superlattices compared to strained-layer superlattices.",

author = "Nozik, {A. J.} and Thacker, {B. R.} and Turner, {J. A.} and J. Klem and H. Morko{\c c}",

note = "Work performed by Solar Energy Research Institute, Golden, Colorado, and Coordinated Science Laboratory, University of Illinois, Urbana, Illinois",

year = "1987",

doi = "10.1063/1.98118",

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T1 - Photocurrent Spectroscopy of Lattice-Matched Superlattice Electrodes in Photoelectrochemical Cells

AU - Nozik, A. J.

AU - Thacker, B. R.

AU - Turner, J. A.

AU - Klem, J.

AU - Morkoç, H.

N1 - Work performed by Solar Energy Research Institute, Golden, Colorado, and Coordinated Science Laboratory, University of Illinois, Urbana, Illinois

PY - 1987

Y1 - 1987

N2 - Photocurrent spectra of GaAs/Al0.38Ga0.62As lattice-matched superlattice electrodes were obtained in photoelectrochemical cells containing nonaqueous liquid electrolyte; spectra were compared for two electron acceptors, cobalticinium and ferrocinium, having redox potentials (energy levels) that differ by 1.33 V. The spectra were found to be independent of acceptor energy levels, in sharp contrast to previous results with GaAs/GaAs0.5P0.5As strained-layer superlattices. These results indicate that for lattice-matched systems hot-electron transfer from upper quantum states in the quantum wells is not a dominant process. This is explained by the much lower surface trapping rates in lattice-matched superlattices compared to strained-layer superlattices.

AB - Photocurrent spectra of GaAs/Al0.38Ga0.62As lattice-matched superlattice electrodes were obtained in photoelectrochemical cells containing nonaqueous liquid electrolyte; spectra were compared for two electron acceptors, cobalticinium and ferrocinium, having redox potentials (energy levels) that differ by 1.33 V. The spectra were found to be independent of acceptor energy levels, in sharp contrast to previous results with GaAs/GaAs0.5P0.5As strained-layer superlattices. These results indicate that for lattice-matched systems hot-electron transfer from upper quantum states in the quantum wells is not a dominant process. This is explained by the much lower surface trapping rates in lattice-matched superlattices compared to strained-layer superlattices.

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Photocurrent Spectroscopy of Lattice-Matched Superlattice Electrodes in Photoelectrochemical Cells

Abstract

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