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Charge Transfer in and Conductivity of Molecularly Doped Thiophene-Based Copolymers

  • The electrical conductivity of organic semiconductors can be enhanced by orders of magnitude via doping with strong molecular electron acceptors or donors. Ground-state integer charge transfer and charge-transfer complex formation between organic semiconductors and molecular dopants have been suggested as the microscopic mechanisms causing these profound changes in electrical materials properties. Here, we study charge-transfer interactions between the common molecular p-dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane and a systematic series of thiophene-based copolymers by a combination of spectroscopic techniques and electrical measurements. Subtle variations in chemical structure are seen to significantly impact the nature of the charge-transfer species and the efficiency of the doping process, underlining the need for a more detailed understanding of the microscopic doping mechanism in organic semiconductors to reliably guide targeted chemical design.

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Author:Fatemeh Ghani, Andreas Opitz, Patrick Pingel, Georg Heimel, Ingo Salzmann, Johannes Frisch, Dieter NeherORCiDGND, Argiri Tsami, Ullrich Scherf, Norbert Koch
Parent Title (English):Journal of polymer science : B, Polymer physics
Place of publication:Hoboken
Document Type:Article
Year of first Publication:2015
Year of Completion:2015
Release Date:2017/03/27
Tag:charge transfer; conducting polymers; doping; thiophene
Page Number:6
First Page:58
Last Page:63
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert