Work

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

Year: 2019

Type: article

Abstract: 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.

Source: Journal of Photochemistry and Photobiology A Chemistry

DOI: 10.1016/j.jphotochem.2019.111894

Authors: Mika Tamski, Felix Blumenschein, Christophe Roussel, Jean-Philippe Ansermet

Institution: École Polytechnique Fédérale de Lausanne

Language: English

Topic: Photocathodes and Microchannel Plates

Subfield: Instrumentation

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,600

Funders: National Science Foundation, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Rothschild Caesarea Foundation