title: Roles of 3-Ethylrhodanine in Attaining Highly Ordered Crystal Arrays of Ambipolar Diketopyrrolopyrrole Oligomers.
abstract: Until now, only limited DPP oligomers delivered ambipolar semiconductor characteristics. To develop a facile strategy of preparing ambipolar mono-DPP oligomers, two dithienyl diketopyrrolopyrrole (DPPT) based-conjugated molecules, DPPT-RD and DPPT-DCV, which contain 3-ethylrhodanine (RD) and dicyano-2-vinyl (DCV) end substituents were synthesized. The influences of the -RD end substituents on the molecular properties, solid-state morphology, and OFET performances of the DPPT oligomer were investigated. The UV-vis absorption and CV results showed that the RD end substituents provide the DPPT oligomer suitable EHOMOand ELUMOfor hole and electron injection from the Au source-drain electrodes. Moreover, the RD end substituents also improve the crystalline nature of the DPPT oligomer. That is, DPPT-RD can form crystal arrays with good lattice orientation, larger crystalline size, and without polymorphism. With those properties, DPPT-RD thus display ambipolar characteristic with μhand μereaching 2.16 × 10-2and 7.27 × 10-2cm2V-1s-1, respectively.
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: San-Lien
authors.initials: SL
authors.lastname: Wu
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: Yi-Fan
authors.initials: YF
authors.lastname: Huang
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: Chou-Ting
authors.initials: CT
authors.lastname: Hsieh
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: Bo-Han
authors.initials: BH
authors.lastname: Lai
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: Po-Sen
authors.initials: PS
authors.lastname: Tseng
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: Jou-Tsen
authors.initials: JT
authors.lastname: Ou
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: Ssu-Ting
authors.initials: ST
authors.lastname: Liao
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: Szu-Yu
authors.initials: SY
authors.lastname: Chou
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: Kuan-Yi
authors.initials: KY
authors.lastname: Wu
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University , 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan.
authors.forename: Chien-Lung
authors.identifier: http://orcid.org/0000-0002-5977-2836
authors.initials: CL
authors.lastname: Wang
keywords: ambipolar; diketopyrrolopyrrole; dye; organic semiconductor; solid-state morphology