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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.51: Poster
Montag, 27. März 2023, 18:00–20:00, P3
Morphology Control of Titanium Thin Films in a Low Temperature Process — •Guangjiu Pan1, Shanshan Yin1, Linus F. Huber1, Caroline Ehgartner2, Nicola Hüsing2, Matthias Schwartzkopf3, Stephan V. Roth3,4, and Peter Müller-Buschbaum1,5 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2Universität Salzburg, 5020 Salzburg, Austria — 3DESY, 22607 Hamburg, Germany — 4KTH Royal Institute of Technology, SE 100 44 Stockholm, Sweden — 5TUM, MLZ, 85748 Garching, Germany
A low-temperature routine to realize inorganic hole-blocking layers (HBLs) is important for the commercialization of perovskite solar cells. Fabricating HBLs 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). A joint process of UV treatment and water-vapor treatment is introduced to substitute the traditional high-temperature calcination. Morphology tailoring of titania thin films in the low-temperature process is achieved by managing phase separation of the polymer template. The surface morphologies of titania films are probed via scanning electron microscopy and GISAXS. The optical properties are examined with ultraviolet-visible spectroscopy and photoluminescence spectra.