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HL: Fachverband Halbleiterphysik
HL 9: Oxide Semiconductors: Growth and Fabrication
HL 9.4: Vortrag
Montag, 9. März 2026, 15:45–16:00, POT/0051
(N:)CuBi2O4 photocathode thin films for photoelectrochemical water splitting — •Miriam J. Fehrenbach1,2, Dominic Rapf1,2, Katarina S. Flashar1,2, Ian D. Sharp1,2, and Verena Streibel1,2 — 1Walter Schottky Institute, Technical University of Munich, Garching, Germany — 2Physics Department, TUM School of Natural Sciences, Technical University of Munich, Garching, Germany
Photoelectrochemical (PEC) water splitting is a promising pathway to carbon-neutral solar fuels. While metal oxides are well explored as photoanodes, complementary photocathodes remain scarce. Potential candidates are Cu-based oxides, which naturally exhibit p-type conductivity. Among them, copper bismuthate (CuBi*O*) is a promising material [1], combining a visible-light bandgap with high photocurrent onset potentials [2], but suffering from poor charge transport [1]. To address this limitation, we developed a reactive co-sputtering and annealing process to synthesize high-quality, nitrogen-modified CuBi*O* thin films. We systematically examine structural and optical effects of nitrogen incorporation and find a significant improvement in PEC activity. To understand this enhanced performance, we investigate the charge carrier transport properties with (photo)conductivity measurements. [1] J. K. Cooper et al., Chem. Mater., 2021, 33, 3, 934*945. [2] N. T. Hahn et al., J. Phys. Chem. C, 2012, 116, 10, 6459*6466.
Keywords: thin films; copper bismuthate; photoelectrochemistry; water splitting; photocathode