Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.18: Poster
Dienstag, 18. März 2025, 10:00–12:30, P3
Reactive Sputter Deposition and Nitrogen Modification of CuBi2O4 as Photocathode — •Dominic Rapf1,2, Tsedenia A. Zewdie1,2, Ian D. Sharp1,2, and Verena Streibel1,2 — 1Walter Schottky Institute, Technical University of Munich, D-85748 Garching, Germany — 2Physics Department, TUM School of Natural Sciences, Technical University of Munich, D-85748 Garching, Germany
Copper bismuthate (CuBi2O4) is a ternary oxide that is of special interest for photoelectrochemical (PEC) water splitting. Unlike most transition metal oxides, which predominantly exhibit n-type conductivity, copper bismuthate is a native p-type semiconductor. [1] In addition, it has a suitable bandgap for the absorption of visible light, as well as a high photocurrent onset potential > 1 V vs. RHE. [2] These properties make CuBi2O4 highly desirable as a photocathode. This project focuses on the development of reactive co-sputter recipes to deposit copper bismuthate thin films and their structural, optical, morphological and opto-electronic analysis. In addition, we explore nitrogen incorporation to narrow the band gap of CuBi2O4 for more efficient light absorption (N:CuBi2O4). By modifying the nitrogen content in the reactive gas mixture and applying post-annealing treatments, we can tailor the level of nitrogen incorporation. On a library of N:CuBi2O4 thin films, we investigate the impact of nitrogen incorporation on optical and structural properties and assess their PEC performance.
[1] J. K. Cooper et al., Chem. Mater. 2021, 33, 3, 934–945 [2] D. Kang et al., Chem. Mater. 2016, 28, 12, 4331–4340
Keywords: Green Hydrogen; Solar Water Splitting; Nitrogen Doping; Copper Bismuthate