Photocurrent Spectroscopy of Lattice-Matched Superlattice Electrodes in Photoelectrochemical Cells

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

Research output: Contribution to journalArticlepeer-review

21 Scopus Citations


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.

Original languageAmerican English
Pages (from-to)34-36
Number of pages3
JournalApplied Physics Letters
Issue number1
StatePublished - 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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