Tuning the charge carrier polarity of organic transistors by varying the electron affinity of the flanked units in diketopyrrolopyrrole-based copolymers

Liu, Qian and Wang, Yang and Kohara, Akihiro and Matsumoto, Hidetoshi and Manzhos, Sergei and Feron, Krishna and Bottle, Steven E. and Bell, John and Michinobu, Tsuyoshi and Sonar, Prashant (2020) Tuning the charge carrier polarity of organic transistors by varying the electron affinity of the flanked units in diketopyrrolopyrrole-based copolymers. Advanced Functional Materials, 30 (7). ISSN 1616-301X


Abstract

Fine‐tuning of the charge carrier polarity in organic transistors is an important step toward high‐performance organic complementary circuits and related devices. Here, three new semiconducting polymers, namely, pDPF‐DTF2, pDPSe‐DTF2, and pDPPy‐DTF2, are designed and synthesized using furan, selenophene, and pyridine flanking group‐based diketopyrrolopyrrole cores, respectively. Upon evaluating their electrical properties in transistor devices, the best performance has been achieved for pDPSe‐DTF2 with the highest and average hole mobility of 1.51 and 1.22 cm2 V−1 s−1, respectively. Most intriguingly, a clear charge‐carrier‐polarity change is observed when the devices are measured under vacuum. The pDPF‐DTF2 polymer exhibits a balanced ambipolar performance with the µh/µe ratio of 1.9, whereas pDPSe‐DTF2 exhibits p‐type dominated charge carrier transport properties with the µh/µe ratio of 26.7. Such a charge carrier transport change is due to the strong electron‐donating nature of the selenophene. Furthermore, pDPPy‐DTF2 with electron‐withdrawing pyridine flanking units demonstrates unipolar n‐type charge transport properties with an electron mobility as high as 0.20 cm2 V−1 s−1. Overall, this study demonstrates a simple yet effective approach to switch the charge carrier polarity in transistors by varying the electron affinity of flanking groups of the diketopyrrolopyrrole unit.


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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: 17 Sep 2020 00:10
Last Modified: 30 Sep 2020 03:25
Uncontrolled Keywords: charge carrier polarity; copolymers; diketopyrrolopyrrole; electron affinity; organic transistors
Fields of Research (2008): 03 Chemical Sciences > 0399 Other Chemical Sciences > 039999 Chemical Sciences not elsewhere classified
Fields of Research (2020): 34 CHEMICAL SCIENCES > 3499 Other chemical sciences > 349999 Other chemical sciences not elsewhere classified
Identification Number or DOI: https://doi.org/10.1002/adfm.201907452
URI: http://eprints.usq.edu.au/id/eprint/39376

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