High bulk electron mobility diketopyrrolopyrrole copolymers with perfluorothiophene

Christian Mueller^a, Chetan Raj Singh^a, Mukundan Thelakkat^a, Huettner Sven^b

^aApplied Functional Polymers, University of Bayreuth, Universitystr-30, Bayreuth, 95440, Germany

^bSolar Energy Research, University of Bayreuth, DE, Universitystr-30, Bayreuth, Germany

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Christian Mueller, 042
Publication date: 5th February 2015

We address the question of designing high electron mobility polymers by increasing the planarization using diffusive non-bonding heteroatom interactions in diketopyrrolopyrrole polymers. For this, three different diketopyrrolo[3,4-c]pyrrole (DPP) derivatives with thienyl-, 2-pyridinyl- and phenyl-flanked cores were copolymerized with an electron-rich thiophene unit as well as an electron-deficient 3,4-difluorothiophene unit as comonomer to obtain diverse PDPPs, which vary systematically in their structures. The crystallinity differs significantly with clear trends on varying both flanking unit and comonomer. The optical gap and energy levels depend more on the nature of the flanking aryl units rather than on fluorination. Additionally, we compare the charge transport properties, using different methods to differentiate between interface or orientation effects and bulk charge carrier transport. In OFET devices very high electron as well as hole mobilities (up to 0.6 cm²V^-1s^-1) were obtained and fluorination led to a more pronounced n-type nature in all polymers, resulting in ambipolar behavior in otherwise p-type materials. In contrast, SCLC measurements showed a strong influence of the flanking units on electron mobilities (fig.1). Especially, the elegant synthetic strategy of combining pyridyl flanking units with difluorothiophene as the comonomer culminated in a record bulk electron mobility of 4.3×10^-3 cm²V^-1s^-1 in polymers.
Design strategy of diketopyrrolopyrrole copolymers and the structure property relation with respect to bulk electron mobility
Mueller, C. J.: Singh, C. R.; Fried, M.; Huettner, S. ; Thelakkat, M. High bulk electron mobility diketopyrrolopyrrole copolymers with perfluorothiophene. 2015, submitted to Advanced Functional Materials Neubig, A; Thelakkat, M; Random vs. alternating donor-acceptor copolymers: a comparative study of absorption and field effect mobility. Polymer, 2014, 55, 2621–2627.

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