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HL: Fachverband Halbleiterphysik

HL 75: Poster IIIB

HL 75.28: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/3OG

Investigation of charge carrier dynamics in Z-scheme water splitting systems — •Nathalie Schmid, Yiou Wang, Jochen Feldmann, and Jacek Stolarczyk — Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany

The so-called "Z-scheme", mimicking the photosystem II - photosystem I in natural photosynthesis, has emerged as a cutting-edge system for efficient photocatalytic water splitting. It consists of two narrow-bandgap semiconductors and is therefore capable of absorbing light in the visible range. One semiconductor acts as oxygen evolution photocatalyst and the other as hydrogen evolution photocatalyst, connected by recycled redox pairs[1,2]. Although the trial-and-error development of materials has boosted the performance over the last two decades, the efficiencies are still far from economically satisfactory. This is mainly due to the lack of fundamental physical knowledge of a Z-scheme photosystem. Therefore, we apply transient absorption spectroscopy to investigate the charge carrier dynamics in an organic/inorganic Z-scheme system, Pt-CN/I-/IO3-/PtOx-WO3 and Pt-CN/Fe2+/Fe3+/BiVO4.

[1] Y. Wang et al., Mimicking Natural Photosynthesis: Solar to Renewable H2 Fuel Synthesis by Z-Scheme Water Splitting Systems. Chem. Rev. 118, 5201 (2018)

[2] J. Stolarczyk et al., Challenges and Prospects in Solar Water Splitting and CO2 Reduction with Inorganic and Hybrid Nanostructures, ACS Catal. 8, 3602 (2018)