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MM: Fachverband Metall- und Materialphysik
MM 4: Materials for the Storage and Conversion of Energy I
MM 4.5: Vortrag
Montag, 9. März 2026, 11:45–12:00, SCH/A216
Tunable TiOxNy Photoelectrodes for Efficient Solar Energy Conversion — •Sebastian Trautschold and Johanna Eichhorn — TUM School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
Oxynitrides have recently emerged as a versatile material class for photoelectrochemical energy conversion, offering a pathway to combine the stability of oxides with the visible-light absorption and favorable charge transport of nitrides. Their key advantage lies in the continuous tunability of optical and electronic properties via adjusting the O/N ratio. TiOxNy provides a particularly illustrative platform: while TiO2 is limited by a wide bandgap and TiN is metallic, TiOxNy can be tuned into an intermediate semiconducting regime, enabling improved utilization of the solar spectrum without sacrificing transport.
Here, we deposit TiOxNy thin films by pulsed gas reactive sputtering, enabling precise stoichiometric control over a broad composition range. Post-annealing in ammonia and nitrogen is then used as an additional handle to tailor crystallinity, phase evolution, and defect chemistry. By correlating deposition and annealing parameters with structural, chemical, and optoelectronic characteristics - particularly bandgap and defect properties - we identify processing windows that optimize qualities relevant for solar harvesting. Our results demonstrate the strong sensitivity of TiOxNy to both growth kinetics and thermal treatment, and establish practical guidelines for engineering oxynitride photoelectrodes toward efficient and durable solar energy conversion systems.
Keywords: Bandgap engineering; Reactive sputtering; Photoelectrochemical energy conversion; TiON; Oxynitrides