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An air-stable DPP-thieno-TTF copolymer for single-material solar cell devices and field effect transistors

Arumugam, Sasikumar and Cortizo-Lacalle, Diego and Rossbauer, Stephan and Hunter, Simon and Kanibolotsky, Alexander L. and Inigo, Anto R. and Lane, Paul A. and Anthopoulos, Thomas D. and Skabara, Peter J. and Inigo, Jesuraj (2015) An air-stable DPP-thieno-TTF copolymer for single-material solar cell devices and field effect transistors. ACS Applied Materials and Interfaces, 7 (51). pp. 27999-28005. ISSN 1944-8244

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Following an approach developed in our group to incorporate tetrathiafulvalene (TTF) units into conjugated polymeric systems, we have studied a low band gap polymer incorporating TTF as a donor component. This polymer is based on a fused thieno-TTF unit that enables the direct incorporation of the TTF unit into the polymer, and a second comonomer based on the diketopyrrolopyrrole (DPP) molecule. These units represent a donor-acceptor copolymer system, p(DPP-TTF), showing strong absorption in the UV-visible region of the spectrum. An optimized p(DPP-TTF) polymer organic field effect transistor and a single material organic solar cell device showed excellent performance with a hole mobility of up to 5.3 x 10-2 cm2/(V s) and a power conversion efficiency (PCE) of 0.3%, respectively. Bulk heterojunction organic photovoltaic devices of p(DPP-TTF) blended with phenyl-C71-butyric acid methyl ester (PC71BM) exhibited a PCE of 1.8%.