Probing charge transfer processes at p-GaAs electrodes under weak optical excitation
Open accessAbstract
The p-GaAs photocathode/acetonitrile interface was characterised in the dark and with tens of μW/cm2 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 photo-cathode 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.
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References 81 · Cited by 4
- Authors
- Tamski, M., Blumenschein, F., Roussel, C., & Ansermet, J.-P.
- Affiliations
- École Polytechnique Fédérale de Lausanne (CH)
- Corresponding author
- Tamski, Mika
- Venue
- Journal of Photochemistry and Photobiology A: Chemistry
- Publisher
- Elsevier BV
- Published
- 2019-09
- Volume
- 382
- Pages
- 111894
- ISSN
- 1010-6030 (ISSN-L)
- OpenAlex
- W2947755464
- Cited by
- 4
- References
- 81
- Citations by year
- 2026: 1 · 2025: 1 · 2020: 1 · 2019: 1
- FWCI
- 0.18
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Photochemistry and Photobiology A Chemistry (publishedVersion, cc-by)
- Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
- Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Photocathodes and Microchannel Plates
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
- Keywords
- charge transfer, acetonitrile electrolyte, redox mediators, Ru(bpy)3 2+, benzoquinone, surface states, electron transfer kinetics, photoelectrochemistry
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