Morphological impact of insulator on inkjet-printed transistor

International audienceThis study reports on the impact of electrodes (source and drain) and insulator cross-sectional profile on the electrical behavior of printed organic field effect transistors (OFET). Varying processing technique from classical lithography to inkjet printing shows different cross-sectional profile. Indeed, due to coffee stain effect (usually considered as a drawback), inkjet-printed insulator shows wave-shaped profile although spin-coated one is perfectly smooth. However, OFET electrical behavior is not drastically impacted by insulator cross-sectional profile. Moreover, this study clearly demonstrates that independently of insulator cross sectional profile, OFET fabricated with printed-electrodes shows the worst electrical characteristics. Consequently, this work clearly demonstrates that a challenging issue for the fabrication of efficient fully-printed OFET relies on drain and source optimization (morphology or material for instance)