1. Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), , Singapore, 117602;2. Microelectronics Research Centre, The University of Texas at Austin, , Austin, TX, 78758 USA;3. Institute of Chemistry, Academica Sinica, , Taipei, 11529 Taiwan, Republic of China;4. Department of Mechanical Engineering, National University of Singapore, , Singapore, 117576
Abstract:
A fused aromatic furan‐substituted diketopyrrolopyrrole and novel diphenylfumaronitrile conjugated building blocks are used for the synthesis of an alternating copolymer ( DPFN‐DPPF ) via Suzuki polycondensation. In this paper, the first attempt to use the diphenylfumaronitrile building block for the synthesis of conjugated polymer is described. The number‐average and weight‐average molecular weights calculated for DPFN‐DPPF are 20 661 and 66 346 g mol?1, respectively. The optical bandgap calculated for DPFN‐DPPF is 1.53 eV whereas the highest occupied molecular orbital (HOMO) value calculated by photoelectron spectroscopy in air (PESA) is 5.50 eV. The calculated HOMO value is lower, which is suitable for stable organic electronic devices. DPFN‐DPPF polymer is used as an active layer in bottom‐contact bottom‐gate organic thin‐film transistor devices and the thin film exhibits a hole mobility of 0.20 cm2 V?1 s?1 in air.
