Journal
ORGANIC ELECTRONICS
Volume 16, Issue -, Pages 101-108Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2014.11.001
Keywords
Copolymer; Ambipolar; Organic field-effect transistors; Charge mobility
Funding
- National Basic Research Program of China (973 Program) [2013CB834805]
- National Science Fund for Distinguished Young Scholars of China [51125013]
- Research Fund for the Doctoral Program of Higher Education of China [20120141110029]
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A new copolymer P(DTCBTZ) of dithienocoronenediimide (DTCDI) and benzo(bis) thiadiazole (BTZ) as the active layer of organic field-effect transistors (OFETs) is reported. The combination of DTCDI with long alkyl chains and BTZ without alkyl chains results in reduced steric hindrance between acceptors of different polymer backbones. 2,2'-bithiophene is introduced into P(DTCBTZ), and thus donor-acceptor (D-A) interactions are induced. Absorption spectra of solution and thin films of P(DTCBTZ) reveal the existence of relatively strong aggregations of P(DTCBTZ) copolymers in solid state. The new copolymer of P(DTCBTZ) has a HOMO of -5.54 eV and a LUMO of -3.72 eV, which are suitable for both hole and electron transport. Bottom-gate and top-contact (BGTC) transistors were prepared and balanced charge transport was observed, with hole mobility of 0.018 cm(2) V-1 s(-1) and electron mobility of 0.019 cm(2) V-1 s(-1), indicating potential for application of polymers containing DTCDI in ambipolar semiconductors. (C) 2014 Elsevier B.V. All rights reserved.
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