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- Title
Extended Conjugated Donor-Acceptor Molecules with E-(1,2-Difluorovinyl) and Diketopyrrolopyrrole (DPP) Moieties toward High-Performance Ambipolar Organic Semiconductors.
- Authors
Cai, Zhengxu; Luo, Hewei; Chen, Xin; Zhang, Guanxin; Liu, Zitong; Zhang, Deqing
- Abstract
Two diketopyrrolopyrrole (DPP)-based donor-acceptor (D-A) conjugated molecules, DPP-F and DPP-2F, which contain E-(1,2-difluorovinyl) moieties, are reported. The LUMO energies of DPP-F and DPP-2F were estimated to be −3.49 and −3.70 eV, respectively, based on their redox potentials and absorption spectral data; these values were clearly lowered because of the incorporation of electron-withdrawing E-(1,2-difluorovinyl) moieties. Organic field-effect transistors (OFETs) with thin films of DPP-F and DPP-2F were successfully fabricated with conventional techniques. Based on the respective transfer and output characteristics measured in an inert atmosphere, thin films of DPP-2F display ambipolar semiconducting behavior with hole and electron mobilities reaching 0.42 and 0.80 cm2 V−1 s−1, respectively. The as-prepared OFET of DPP-2F already shows high hole and electron mobilities that are not influenced remarkably by thermal annealing. For thin films of DPP-F, only p-type semiconducting behavior was observed in both an inert atmosphere and air, and the hole mobility increased to 0.1 cm2 V−1 s−1 after thermal annealing. XRD and AFM studies were performed with thin films of DPP-F and DPP-2F after annealing at different temperatures.
- Subjects
SOLID state electronics; THIN films; SURFACE coatings; ORGANIC semiconductors; ELECTRON mobility
- Publication
Chemistry - An Asian Journal, 2014, Vol 9, Issue 4, p1068
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.201301312