Acceptor-donor-acceptor conjugated oligomers based on diketopyrrolopyrrole and thienoacenes with four,five and six rings for organic thin-film transistors |
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Authors: | Qian Du Jing Shao Yao Gao Wei-li Li Hong-kun Tian Dong-hang Yan Yan-hou Geng Fo-song Wang |
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Affiliation: | 1. School of Material Science and Engineering and Collaborative Innovation Centre of Chemical Science and Engineering(Tianjin), Tianjin University, Tianjin 300072, China;2. The 46th Institute of the Sixth Academy of China Aerospace Science & Industry Corporation, Hohhot 010010, China;3. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry,Chinese Academy of Sciences, Changchun 130022, China;4. School of Material Science and Engineering and Collaborative Innovation Centre of Chemical Science and Engineering(Tianjin), Tianjin University, Tianjin 300072, China;State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry,Chinese Academy of Sciences, Changchun 130022, China |
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Abstract: | Three acceptor-donor-acceptor (A-D-A) conjugated oligomers, i.e., O1, O2 and O3, have been synthesized using diketopyrrolopyrrole (DPP) as an electron-acceptor unit, and naphtho[1,2-b:5,6-b’]dithiophene (NDT), anthra[1,2-b:5,6-b’]dithiophene (ADT) or dithieno[3,2-b:3’,2’-b’]naphtho[1,2-b:5,6-b’]dithiophene (DTNDT) as electron-donor unit. These oligomers exhibit identical highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels, which were ca. ?5.1 and ?3.3 eV, respectively. Upon thermal annealing, all three oligomers formed thin films with ordered microstructures, and their organic thin film transistors (OTFTs) exhibited p-type transport behavior. The mobility was increased with an extension of the size of D-units. O3 showed the best OTFT performance with the mobility of up to 0.20 cm2·V?1·s?1. The film quality of O3 was improved by adding 1 wt% poly(methylmethacrylate) (PMMA). In consequence, the mobility of the O3-based devices was further enhanced to 0.30 cm2·V?1·s?1. |
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Keywords: | Diketopyrrolopyrrole (DPP) Thienoacene Conjugated oligomers Organic thin-film transistors (OTFTs) |
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