title: D-A1-D-A2 Copolymer Based on Pyridine-Capped Diketopyrrolopyrrole with Fluorinated Benzothiadiazole for High-Performance Ambipolar Organic Thin-Film Transistors.
abstract: A novel donor-acceptor-donor-acceptor (D-A1-D-A2) π-conjugated copolymer (PDBPyDT2FBT) has been prepared by Stille coupling reaction. It is found that PDBPyDT2FBT exhibits low LUMO energy level mainly because of multiple electron-deficient units and donor-acceptor interaction, which is favorable to obtain more efficient electron injection and transport in organic thin-film transistors (OTFTs). Moreover, introducing two electron-deficient moieties into the thiophene-containing copolymer increases the length of conjugated main chain and enhances the coplanarity of the backbone, which may be beneficial for promoting the molecular crystallinity and improving molecular ordering capability at low temperatures. High electron and hole mobilities up to 0.65 and 0.24 cm(2) V(-1) s(-1) were obtained at relatively low annealing temperatures of 100 and 80 °C, respectively, implying that PDBPyDT2FBT is a promising ambipolar polymer semiconductor applied in low-cost and large-area manufacturing of OTFTs.
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Long
authors.initials: L
authors.lastname: Xu
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, PR China.
authors.forename: Hongguang
authors.initials: H
authors.lastname: Shen
authors.forename: Xianming
authors.initials: X
authors.lastname: Duan
authors.affiliation: National Center for Nanoscience and Technology , Beijing 100190, PR China.
authors.forename: Jianqi
authors.initials: J
authors.lastname: Zhang
authors.affiliation: National Center for Nanoscience and Technology , Beijing 100190, PR China.
authors.forename: Zhixiang
authors.initials: Z
authors.lastname: Wei
authors.forename: Zhengran
authors.initials: Z
authors.lastname: Yi
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, PR China.
authors.forename: Chong-an
authors.initials: CA
authors.lastname: Di
authors.forename: Shuai
authors.initials: S
authors.lastname: Wang
keywords: OTFT; ambipolar; annealing temperature; donor−acceptor−donor−acceptor copolymer; electron mobility; hole mobility