Observation of ambipolar field-effect behavior in donor-acceptor conjugated copolymers
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- Observation of ambipolar field-effect behavior in donor-acceptor conjugated copolymers
- Cho, Shinuk; Seo, Jung Hwa; Kim, Gi-Hwan; Kim, Jin Young; Woo, Han Young
- Active Layer; Ambipolar; Ambipolar properties; Conjugated copolymers; D-A copolymers; Donor-acceptors; Electron-deficient; Field-effect; Hydroxyl groups; P-type; Passivation layer; Semiconductor-insulator interface
- Issue Date
- ROYAL SOC CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY, v.22, no.39, pp.21238 - 21241
- Although donor (D)-acceptor (A) conjugated copolymers possess an electron deficient unit, most D-A copolymers exhibit only hole transport properties (p-type). While there are some D-A copolymers that show ambipolarity, n-type behaviour is highly dependent on the type of acceptor used. In this work, ambipolar field-effect behaviour was derived from general D-A conjugated copolymers, believed to be a typical p-type material, by introducing a functional passivation layer between gate dielectric and active layers using polypropylene-co-1-butene (PPcB). The PPcB layer effectively covered the hydroxyl groups and induced a reduction in the energetic disorder at the semiconductor-insulator interface. As a result, the FET devices fabricated using D-A conjugated copolymers, such as PCDTBT, PTBT and Si-PCPDTBT, showed clear ambipolar properties.
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