Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Organic Electronics and Photovoltaics - Layer Morphology and Molecular Aggregation
CPP 3.4: Talk
Monday, March 12, 2018, 10:30–10:45, C 243
Influence of solvent additive 1,8-octanedithiol on P3HT:PCBM solar cells — Weijia Wang1, Lin Song1, David Magerl1, Daniel Mosegui Gonzales1, Volker Körstgens1, Martine Philipp1, Jean-Francois Moulin2, and •Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2HZG at MLZ, 85747 Garching
Organic solar cells based on poly(3-hexylthiophen-2,5-diyl):phenyl-C60-butyric acid methyl ester (P3HT:PCBM) have developed into a well-controlled model system for studying fundamental questions, although device efficiencies of other blends using low band gap polymers demonstrated significantly higher device efficiencies. We investigate the influence of solvent additive 1,8-octanedithiol (ODT) on polymer crystallinity, surface and inner morphology, and quantitative molecular miscibility of P3HT and PCBM as function of the ODT volume concentration. The crystallinity is probed with absorption spectroscopy and grazing incidence wide angle X-ray scattering. The morphology and miscibility are characterized via AFM and time-of-flight grazing incidence small angle neutron scattering. ODT processing proves to be beneficial for promoting P3HT crystallinity and optimizing the inner morphology in terms of substructures and molecular miscibility, consequently leading to a better photovoltaic performance.