Probing charge transfer processes at p-GaAs electrodes under weak optical excitation

The p-GaAs photocathode/acetonitrile interface was characterised in the dark and with tens of mu W/cm(2) laser powers at 830 nm wavelength, using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Two redox mediators were used that present completely different behaviours under low optical excitation: one (Tris(2,2'-bipyridine)ruthenium(II) hexafluorophosphate) is sensitive to the surface states of the photocathode and the other (benzoquinone) is not. The combined electrochemical methods allow us to characterize the energetics of the electrode-electrolyte interface as well as the dominant electron transfer process.


Published in:
Journal of Photochemistry and Photobiology A-Chemistry, 382, 111894
Year:
Sep 01 2019
ISSN:
1010-6030
Keywords:
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 Record created 2019-09-05, last modified 2020-04-20

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