Berlin 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HL: Fachverband Halbleiterphysik
HL 16: Functional Semiconductors for Renewable Energy Solutions I
HL 16.8: Talk
Tuesday, March 19, 2024, 11:30–11:45, ER 325
CeTa(O,N)3 and CeNb(O,N)3 perovskite oxynitrides for photoelectrochemical energy conversion — •Gabriel Grötzner1,2, Laura I. Wagner1,2, Lukas Wolz1,2, Verena Streibel1,2, and Ian D. Sharp1,2 — 1Walter Schottky Institute, Technische Universität München, Germany — 2Physics Department, TUM School of Natural Sciences, Technische Universität München, Germany
Photoelectrochemical (PEC) water splitting presents a promising avenue for the efficient storage of solar energy in chemical bonds. Perovskite oxynitrides, emerging as a new class of materials for PEC water splitting, hold potential to overcome certain limitations associated with more extensively studied metal oxides, particularly as many perovskite oxynitrides have a band gap of ∼2 eV. However, the optoelectronic properties of many perovskite oxynitrides are not well understood and investigated. This study introduces a novel method for synthesizing thin films of the perovskite oxynitrides CeTa(O,N)3 and CeNb(O,N)3 through a spin coating process followed by a two-step annealing procedure in ambient air and ammonia. The investigation explores the structural, compositional and optoelectronic properties of the thin films and furthermore compares the results between CeTa(O,N)3 and CeNb(O,N)3. Additionally, the influence of the annealing conditions in ammonia on the material properties is evaluated. The experimental findings unveil bandgaps in the visible range and n-type conductivity for both materials. As these results suggest use cases for both materials in PEC watersplitting, their viability as photoanodes is also evaluated.
Keywords: PEC; Perovskites; Oxynitrides; Water splitting; Thin films