Importance of Blade-Coating Temperature for Diketopyrrolopyrrole-based Thin-Film Transistors
Jun-Ik Park,
Hyeon-Seok Jeong,
Do-Kyung Kim,
Jaewon Jang,
In Man Kang,
Philippe Lang,
Yun-Hi Kim,
Hyeok Kim,
Jin-Hyuk Bae
Affiliations
Jun-Ik Park
School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
Hyeon-Seok Jeong
School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
Do-Kyung Kim
School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
Jaewon Jang
School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
In Man Kang
School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
Philippe Lang
ITODYS, CNRS UMR 7086, Université Paris Diderot (Paris 7), 15 rue Jean-Antoine de Baïf, 75205 Paris CEDEX 13, France
Yun-Hi Kim
Department of Chemistry and Research Institute for Natural Science, Gyeongsang National University, 501 Jinjudaero, Jinju, Gyeongnam 52828, Korea
Hyeok Kim
Department of Electrical Engineering, Engineering Research Institute (ERI), Gyeongsang National University, 501 Jinjudaero, Jinji, Gyeongnam 52828, Korea
Jin-Hyuk Bae
School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
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.
