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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Molecular Electronics and Excited State Properties I
CPP 3.12: Vortrag
Montag, 16. März 2020, 12:30–12:45, ZEU 260
Characterization and control of aggregation in doped poly(3-hexylthiophene-2,5-diyl) solutions — •Ahmed E. Mansour1,2, Dominique Lungwitz1, Thorsten Schultz1,2, Malavika Arvind3, Ana M. Valencia1, Caterina Cocchi1, Andreas Opitz1, Dieter Neher3, and Norbert Koch1, 2 — 1Institut für Physik & IRIS Adlershof, Humboldt Universität zu Berlin, Germany — 2Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Germany — 3Institut für Physik und Astronomie, Universität Potsdam, Germany
Chemical doping of poly(3-hexylthiophene-2,5-diyl) (P3HT) is commonly achieved by mixing solutions of the dopant molecules and the polymer in predetermined volumes based on the desired dopant ratio. Aggregation in doped P3HT is typically observed as a result of the solution-mixing process, due to decreased solubility of the mixture. In this work, we provide means for characterizing the presence of doped aggregates and their relative amounts with respect to doped isolated polymer chains in tris(pentafluorophenyl)borane (BCF) doped P3HT solutions. This is achieved by the distinction of signatures in the optical absorption spectrum due to polarons in doped aggregates on the one hand, and doped isolated chains on the other hand. We further rely on these signatures to investigate the influence of dopant ratio and absolute concentration of the solution mixture on the relative amount and the size of the aggregates. Finally, we quantify the degree of doping as a function of the structural form, showing a larger degree of doping in the aggregates as compared to the isolated chains.