Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 38: Interfaces and Thin Films II (joint session CPP/DY/O)

O 38.9: Vortrag

Dienstag, 17. März 2020, 12:00–12:15, ZEU 260

Comparison of the effects of solvent additives on the morphology development of printed PPDT2FBT:PC71BM films — •Dan Yang1, Sebastian Grott1, Xinyu Jiang1, Kerstin S. Wienhold1, Matthias Schwartzkopf2, Stephan V. Roth2, and Peter Müller-Buschbaum1,31TU München,Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany — 3Heinz Maier-Leibnitz Zentrum (MLZ), TU München, Lichtenbergstr. 1, 85748 Garching, Germany

The morphology and crystallinity of bulk heterojunction (BHJ) films have profound effects on the performance of organic photovoltaics. Currently, most morphological studies on BHJ films are based on spin-coating as deposition technique. However, to commercialize organic photovoltaic products, large-scale fabrication processes such as printing must be taken into consideration. In the present study, the effects of solvent additives on the morphology formation and polymer crystallinity growth of printed BHJ films are investigated by in-situ grazing incidence small/wide-angle X-ray scattering (GISAXS/GIWAXS). The results show that the solvent additives with different boiling points lead to different film drying behaviors, and the phase demixing is changing in the forming BHJ film along with solvent evaporation. These findings provide valuable insights into the film morphology and crystallinity developments of printed BHJ films, which determines the future design of BHJ film printing for large-scale fabrication.

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