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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.