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Importance of Blade-Coating Temperature for Diketopyrrolopyrrole-based Thin-Film Transistors

School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
ITODYS, CNRS UMR 7086, Université Paris Diderot (Paris 7), 15 rue Jean-Antoine de Baïf, 75205 Paris CEDEX 13, France
Department of Chemistry and Research Institute for Natural Science, Gyeongsang National University, 501 Jinjudaero, Jinju, Gyeongnam 52828, Korea
Department of Electrical Engineering, Engineering Research Institute (ERI), Gyeongsang National University, 501 Jinjudaero, Jinji, Gyeongnam 52828, Korea
Authors to whom correspondence should be addressed.
Crystals 2019, 9(7), 346;
Received: 4 June 2019 / Revised: 26 June 2019 / Accepted: 2 July 2019 / Published: 5 July 2019
(This article belongs to the Special Issue Advances in Thin Film Materials and Devices)
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In this work, the effect of blade-coating temperature on the electrical properties of a conjugated donor–acceptor copolymer containing diketopyrrolopyrrole (DPP)-based thin-film transistors (TFTs) was systematically analyzed. The organic semiconductor (OSC) layers were blade-coated at various blade-coating temperatures from room temperature (RT) to 80 °C. No remarkable changes were observed in the thickness, surface morphology, and roughness of the OSC films as the blade-coating temperature increased. DPP-based TFTs exhibited two noticeable tendencies in the magnitude of field-effect mobility with increasing blade-coating temperatures. As the temperature increased up to 40 °C, the field-effect mobility increased to 148% compared to the RT values. On the contrary, when the temperature was raised to 80 °C, the field-effect mobility significantly reduced to 20.9% of the mobility at 40 °C. These phenomena can be explained by changes in the crystallinity of DPP-based films. Therefore, the appropriate setting of the blade-coating temperature is essential in obtaining superior electrical characteristics for TFTs. A blade-coating temperature of 40 °C was found to be the optimum condition in terms of electrical performance for DPP-based TFTs. View Full-Text
Keywords: organic thin-film transistor; donor–acceptor copolymers; diketopyrrolopyrrole; blade-coating; temperature organic thin-film transistor; donor–acceptor copolymers; diketopyrrolopyrrole; blade-coating; temperature

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Park, J.-I.; Jeong, H.-S.; Kim, D.-K.; Jang, J.; Kang, I.M.; Lang, P.; Kim, Y.-H.; Kim, H.; Bae, J.-H. Importance of Blade-Coating Temperature for Diketopyrrolopyrrole-based Thin-Film Transistors. Crystals 2019, 9, 346.

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