Wu, San-LienSan-LienWuHuang, Yi-FanYi-FanHuangHsieh, Chou-TingChou-TingHsiehLai, Bo-HanBo-HanLaiTseng, Po-SenPo-SenTsengOu, Jou-TsenJou-TsenOuLiao, Ssu-TingSsu-TingLiaoChou, Szu-YuSzu-YuChouWu, Kuan-YiKuan-YiWuCHIEN LUNG WANG2023-11-062023-11-062017-05-0319448244https://scholars.lib.ntu.edu.tw/handle/123456789/636848Until 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 EHOMO and ELUMO for 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 μh and μe reaching 2.16 × 10-2 and 7.27 × 10-2 cm2 V-1 s-1, respectively.enambipolar; diketopyrrolopyrrole; dye; organic semiconductor; solid-state morphologyjournal article10.1021/acsami.7b01702283987142-s2.0-85019001463https://api.elsevier.com/content/abstract/scopus_id/85019001463