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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Poster Session II - Complex Fluids and Perovskites

CPP 14.17: Poster

Tuesday, March 23, 2021, 16:30–18:30, CPPp

Tuning ordered mesoporous titania films via introducing germanium nanocrystals for high-efficient photoanodes — •Nian Li¹, Renjun Guo¹, Wei Chen¹, Volker Körstgens¹, Julian E. Heger¹, Suzhe Liang¹, Stephan V. Roth², and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — ²Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607 Hamburg

With an aim of obtaining high-efficient titania photoanodes, we introduce germanium nanocrystals (GeNCs) into a diblock-copolymer template-assisted sol-gel synthesis. The surface and inner morphologies of the TiO2/GeNC films with different GeNC content after thermal annealing are investigated via scanning electron microscopy and grazing incidence small-angle X-ray scattering (GISAXS). We also probe the crystal phase, chemical composition and optical properties of the nanocomposite films via X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy and ultraviolet-visible spectroscopy. These measurements show that even with GeNC addition, the nanocomposite films still have ordered nanostructures, good crystallinity and high transparency. We further study the charge-carrier dynamics of the nanocomposite films. Compared to pristine titania photoanodes, the GeNC addition enhances the electron transfer, resulting in an overall improvement in the short-circuit current density (Jsc) of the exemplary perovskite solar cells and thereby an enhanced solar cell efficiency.