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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Poster III
CPP 28.22: Poster
Wednesday, March 20, 2024, 11:30–13:30, Poster C
In-situ tracking the evolution of morphology and optical properties of thin films during spraying and annealing for organic solar cells — •Shuxian Xiong1,2, Benedikt Sochor1, Constantin Harder1,2, Peter Müller-Buschbaum2,4, and Stephan V. Roth1,3 — 1DESY, 22607 Hamburg, Germany — 2TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 3KTH Royal Institute of Technology, 10044 Stockholm, Sweden — 4MLZ, TUM, Garching, Germany
Due to the rapid film formation during spraying, typically over tens of seconds, the resultant morphology is a delicate balance between multiple kinetic processes: solvent evaporation, diffusion of the constituents, phase separation, and ordering. The morphology is strongly rate-dependent, and real-time monitoring is necessary to follow the structural evolution with sufficient time resolution so that the properties of the film can be tailored. Based on the ultrasonic spray deposition technique (a scalable large-area deposition technique), using in-situ grazing incidence small/wide-angle x-ray scattering combined with in-situ annealing, this study pioneered the investigation of the morphology formation process from the liquid state to the final dry film under different spraying conditions. An in-depth understanding of the structural evolution during the non-equilibrium process helps to find the suitable processing parameters to produce thin films with well-performed photovoltaic properties in order to establish the relationship between spray processing control and tailored structures and the performance of polymer solar cell devices.
Keywords: x-ray scattering; solar cell