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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics II

CPP 25.4: Vortrag

Dienstag, 10. März 2026, 12:15–12:30, ZEU/0260

Morphological Insights into Spray-Coated Organic Semiconductors — •Shuxian Xiong^1,2, Marie Betker^2,3, Simon Schraad^1,2, Yufeng Zhai², Benedikt Sochor², Sarathlal Koyiloth Vayalil^2,4, Peter Müller-Buschbaum¹, and Stephan V. Roth^2,3 — ¹TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — ²Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany — ³Department of Fibre and Polymer Technology, KTH, Stockholm, Sweden — ⁴Applied Sciences Cluster, University of Petroleum and Energy Studies UPES, Dehradun, Uttarakhand, 248007, India

Ultrasonic spray coating offers improved scalability for large-scale applications, reduced material waste, and enhanced compatibility with various substrates, making it a more cost-effective solution for the mass production of photovoltaic devices. However, how to simply and efficiently build ordered structural networks is still a critical issue. We investigate the morphological transition of organic semiconductors and their effect on device performance using grazing incidence wide-angle X-ray scattering in traditional fullerene systems. By systematically optimizing spray flow rate and substrate temperature, we effectively tailored the film morphology, enhancing molecular crystallization of PTB7-Th and PCBM, resulting in an improvement in device performance of 9% in air, which is one of the highest device efficiencies currently achieved for spray-coated fullerene acceptor-based organic solar cells, and is equivalent to the device efficiencies of spin-coated fullerene acceptor-based organic solar cells.

Keywords: x-ray scattering; organic semiconductors; morphology