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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Hybrid and Perovskite Photovoltaics I
CPP 8.2: Talk
Monday, March 17, 2025, 15:30–15:45, H38
Sputter-Deposited TiOx Thin Film as a Buried Interface Modification Layer for Efficient and Stable Perovskite Solar Cells — •Xiongzhuo Jiang1, Kun Sun1, Zerui Li1, Zhuijun Xu1, Guangjiu Pan1, Yusuf Bulut1,2, Benedikt Sochor2, Matthias Schwartzkopf2, Kristian A. Reck3, Thomas Strunskus3, Franz Faupel3, Stephan V. Roth2, and Peter Müller-Buschbaum1 — 1TUM School of Natural Science, Chair for Functional Materials, 85748 Garching, Germany — 2Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany — 3Lehrstuhl für Materialverbunde, Institut für Materialwissenschaft, Christian Albrechts-Universität zu Kiel, 24143 Kiel, Germany
It is crucial to suppress the non-radiation recombination in the hole-blocking layer (HBL) and at the interface between the HBL and active layer for performance improvement. Herein, TiOx layers are deposited onto a SnO2 layer via sputter deposition at room temperature, forming a bilayer HBL. The structure evolution of TiOx during sputter deposition is investigated via in situ grazing-incidence small-angle X-ray scattering. After sputter deposition of TiOx with a suitable thickness on the SnO2 layer, the bilayer HBL shows a suitable transmittance, smoother surface roughness, and fewer surface defects, thus resulting in lower trap-assisted recombination at the interface between the HBL and the active layer. With this SnO2/TiOx functional bilayer, the perovskite solar cells exhibit higher power conversion efficiencies than the unmodified SnO2 monolayer devices.
Keywords: perovskite solar cells; titania; sputter deposition; buried interface layer; in situ study