Synergistic use of pyridine and selenophene in a diketopyrrolopyrrole-based conjugated polymer enhances the electron mobility in organic transistors

Liu, Qian and Kumagai, Shohei and Manzhos, Sergei and Chen, Yingqian and Angunawela, Indunil and Nahid, Masrur Morshed and Feron, Krishna and Bottle, Steven E and Bell, John and Ade, Harald and Takeya, Jun and Sonar, Prashant (2020) Synergistic use of pyridine and selenophene in a diketopyrrolopyrrole-based conjugated polymer enhances the electron mobility in organic transistors. Advanced Functional Materials, 34 (1):2000489. ISSN 1616-301X


Abstract

To achieve semiconducting materials with high electron mobility in organic field-effect transistors (OFETs), low-lying energy levels (the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO)) and favorable molecular packing and ordering are two crucial factors. Here, it is reported that the incorporation of pyridine and selenophene into the backbone of a diketopyrrolopyrrole (DPP)-based copolymer produces a high-electron-mobility semiconductor, PDPPy-Se. Compared with analogous polymers based on other DPP derivatives and selenophene, PDPPy-Se features a lower LUMO that can decrease the electron transfer barrier for more effective electron injection, and simultaneously a lower HOMO that, however, can increase the hole transfer barrier to suppress the hole injection. Combined with thermal annealing at 240 °C for thin film morphology optimization to achieve large-scale crystallite domains with tight molecular packing for effective charge transport along the conducting channel, OFET devices fabricated with PDPPy-Se exhibit an n-type-dominant performance with an electron mobility (μe) as high as 2.22 cm2 V−1 s−1 and a hole/electron mobility ratio (μh/μe) of 0.26. Overall, this study demonstrates a simple yet effective approach to boost the electron mobility in organic transistors by synergistic use of pyridine and selenophene in the backbone of a DPP-based copolymer.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Research and Innovation Division (12 Jul 2012 -)
Faculty/School / Institute/Centre: Current - Research and Innovation Division (12 Jul 2012 -)
Date Deposited: 11 Sep 2020 04:43
Last Modified: 14 Sep 2020 01:39
Uncontrolled Keywords: electron mobility; electron transport; lowest unoccupied molecular orbital; organic field effect transistors; pyridine-flanked diketopyrrolopyrrole; selenophene
Fields of Research (2008): 09 Engineering > 0904 Chemical Engineering > 090499 Chemical Engineering not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4004 Chemical engineering > 400499 Chemical engineering not elsewhere classified
Identification Number or DOI: https://doi.org/10.1002/adfm.202000489
URI: http://eprints.usq.edu.au/id/eprint/39371

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