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HL: Fachverband Halbleiterphysik

HL 26: Poster II

HL 26.41: Poster

Mittwoch, 11. März 2026, 09:30–11:30, P1

In situ investigation of PEC devices by time-resolved photoluminescence — •Peter Kleinschmidt, Ali Omar, Sahar Shekarabi, David Ostheimer, and Thomas Hannappel — TU Ilmenau, Institute of Physics, Fundamentals of Energy Materials, 98693 Ilmenau

Direct, unassisted photoelectrochemical (PEC) water splitting is a promising approach for the generation of solar hydrogen. At present, PEC devices still suffer from rapid degradation during operation in the electrolyte. In PEC devices, the control of the dynamics of minority charge carriers is crucial for efficient operation. In situ time-resolved photoluminescence (TRPL) measurement provides a direct access to charge carrier lifetimes in the PEC environment. We demonstrate that in situ TRPL reveals early-stage, localized degradation in PEC devices under operating conditions long before any decline in conventional performance metrics, such as a reduction in hydrogen evolution current density, becomes detectable. With this method, we investigate the effect of different surface treatments of dual junction PEC devices, in particular the functionalization with passivation layers and catalysts, on the stability and overall performance.

Keywords: Photoluminescence; Optoelectronics; Photoelectrochemistry; Solar energy conversion