SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 38: Functional semiconductors for renewable energy solutions I

HL 38.7: Vortrag

Donnerstag, 30. März 2023, 11:30–11:45, POT 6

Photoelectrochemical Catalyst Deposition on III-V Semiconductor Surfaces for Direct Solar Water Splitting — •Erica Schmitt, Moritz Kölbach, Margot Guidat, Marco Flieg, Max Nusshör, Anna-Lena Renz, and Matthias May — Universität Tübingen, Institute of Physical and Theoretical Chemistry, Tübingen, Germany

The conversion of solar electrical energy to chemical energy by the generation of hydrogen is believed to play a key role in the transition towards a sustainable energy system. One approach to generate sustainable hydrogen is the use of III-V photoelectrodes in a highly efficient photoelectrochemical water splitting device. Such fully integrated, monolithic systems have a potentially lower balance of system cost compared to more conventional decoupled PV-electrolysis approaches and have already shown to be highly efficient [1].

The III-V semiconductor-electrolyte interface plays a crucial role in the performance of a photoelectrochemical device. Our work focuses on the photoelectrochemical modification of the semiconductor surface with a suitable catalyst and its stabilization in the harsh environment of an acidic electrolyte under operating conditions while also understanding the underlying physicochemical processes. We present an optimized functionalization process to increase the solar-to-hydrogen efficiency and stability of a photoelectrochemical cell, as well as the electrochemical and spectroscopical characterization using, among other methods, reflection anisotropy spectroscopy. [1] May, M., Lewerenz, HJ., Lackner, D. et al., Nat. Commun. 6, 8286 (2015).