Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster 2

CPP 17.23: Poster

Dienstag, 6. September 2022, 11:00–13:00, P2

Morphology control of titania thin films in a low temperature process — •Guangjiu Pan¹, Shanshan Yin¹, Nian Li¹, Tianfu Guan¹, Renjun Guo¹, Suzhe Liang¹, Yuqin Zou¹, Caroline Ehgartner², Nicola Hüsing², and Peter Müller-Buschbaum^1,3 — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany — ²Materialchemie, Chemie und Physik der Materialien, Universität Salzburg, 5020 Salzburg, Austria — ³MLZ, TU München, 85748 Garching, Germany

A low-temperature routine to realize inorganic electron-transport layers (ETLs) is important for the commercialization of perovskite solar cells. Fabricating ETLs at low temperature is energy saving and compatible with flexible substrates. In this work, titania thin films are synthesized at low temperature (below 100 Celsius degree) with a polymer template sol-gel method based on the amphiphilic diblock copolymer polystyrene-b-polyethylene oxide (PS-b-PEO), in combination with selective incorporation of the titanium precursor ethylene glycol-modified titanate (EGMT). Tailoring titania film morphology in the low-temperature process is achieved by managing phase separation of the polymer template. The ratio of polymer, precursor, solvent, and catalyst for the sol-gel solution is varied to tune the thin film morphologies. The surface morphologies of titania films are probed via scanning electron microscopy and GISAXS. The optical properties of the films are examined with ultraviolet-visible spectroscopy.