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Charge-Transfer-Solvent Interaction Predefines Doping Efficiency in p-Doped P3HT Films

: Müller, L.; Nanova, D.; Glaser, T.; Beck, S.; Pucci, A.; Kast, A.K.; Schröder, R.R.; Mankel, E.; Pingel, P.; Neher, D.; Kowalsky, W.; Lovrincic, R.


Chemistry of Materials 28 (2016), No.12, pp.4432-4439
ISSN: 0897-4756
ISSN: 1520-5002
Journal Article
Fraunhofer IAP ()

Efficient electrical doping of organic semiconductors is a necessary prerequisite for the fabrication of high performance organic electronic devices. In this work, we study p-type doping of poly(3-hexylthiophene) (P3HT) with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) spin-cast from two different solvents. Using electron diffraction, we find strong dopant-induced Ï-Ï-stacking for films from the solvent chloroform, but not from chlorobenzene. This image is confirmed and expanded by the analysis of vibrational features of P3HT and polaron absorptions using optical spectroscopy. Here, a red-shifted polaron absorption is found in doped films from chloroform, caused by a higher conjugation length of the polymer backbone. These differences result in a higher conductivity of films from chloroform.