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

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


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 80C. 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 40C, the field-effect mobility increased to 148% compared to the RT values. On the contrary, when the temperature was raised to 80C, the field-effect mobility significantly reduced to 20.9% of the mobility at 40C. 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 40C was found to be the optimum condition in terms of electrical performance for DPP-based TFTs.

Original languageEnglish
Article number346
Issue number7
StatePublished - Jul 2019


  • Acceptor copolymers
  • Blade-coating
  • Diketopyrrolopyrrole
  • Donor
  • Organic thin-film transistor
  • Temperature


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