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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.39: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1A
The mechanism of doping low band gap polymers with a Lewis acid — •Simon Biberger1,2, Viktor Brus2, David Cao2, Brett Yurash2, Dirk Leifert2,3, Thuc-Quyen Nguyen2, and Anna Köhler1 — 1Softmatter Optoelectronics (EP2), University of Bayreuth, Germany — 2Center for Polymers and Organic Solids, UCSB, Santa Barbara, USA — 3Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Münster, Germany
To p-dope organic semiconductors F4TCNQ is commonly used. This doping mechanism relies on the electron transfer from the HOMO of the semiconductor to the LUMO of the dopant. This occurs by a match of those energy levels. For a solution-processed semiconductor this approach suffers from the differential solubility of the dopant, the charge-transfer complex and of the polymer what ultimately limits the processability of the doped semiconductor. In this study we use electrophilic Lewis acids to p-dope conjugated polymers. Work by Zalar et al. (Adv. Mat. 2014, 26, 727-727) showed an increased mobility after addition of Lewis acid. Yet the mechanism behind this doping approach is still elusive. To understand this approach we systematically investigate the effect of structural and electronic factors by varying, e.g., the donor and acceptor strength of the polymer. Optical and electrical characterization, using, e.g., optical spectroscopy and EPR, were performed to understand the influence of the adduct formation on the properties of the polymer.