Sun, Junfeng Park, Hyejin Jung, Younsu Rajbhandari, Grishmi Maskey, Bijendra Bishow Sapkota, Ashish Azuma, Yasuo Majima, Yutaka Cho, Gyoujin Proving Scalability of an Organic Semiconductor To Print a TFT-Active Matrix Using a Roll-to-Roll Gravure Organic semiconductor-based thin-film transistors’ (TFTs) charge-carrier mobility has been enhanced up to 25 cm<sup>2</sup>/V s through the improvement of fabrication methods and greater understanding of the microstructure charge-transport mechanism. To expand the practical feasibility of organic semiconductor-based TFTs, their electrical properties should be easily accessed from the fully printed devices through a scalable printing method, such as a roll-to-roll (R2R) gravure. In this study, four commercially available organic semiconductors were separately formulated into gravure inks. They were then employed in the R2R gravure system (silver ink for printing gate and drain–source electrodes and BaTiO<sub>3</sub> ink for printing dielectric layers) for printing 20 × 20 TFT-active matrix with the resolution of 10 pixels per inch on poly­(ethylene terephthalate) (PET) foils to attain electrical properties of organic semiconductors a practical printing method. Electrical characteristics (mobility, on–off current ratio, threshold voltage, and transconductance) of the R2R gravure-printed 20 × 20 TFT-active matrices fabricated with organic semiconducting ink were analyzed statistically, and the results showed more than 98% device yield and 50 % electrical variations in the R2R gravure TFT-active matrices along the PET web. PET web;R 2R gravure system;microstructure charge-transport mechanism;BaTiO 3 ink;charge-carrier mobility;Proving Scalability;Organic Semiconductor;silver ink;semiconducting ink;threshold voltage;Electrical characteristics;gravure inks;semiconductor-based TFTs;fabrication methods;printing dielectric layers;printing gate;10 pixels;TFT-Active Matrix;R 2R gravure;printing method;device;R 2R gravure TFT-active matrices;scalable printing method 2017-09-14
    https://acs.figshare.com/articles/journal_contribution/Proving_Scalability_of_an_Organic_Semiconductor_To_Print_a_TFT-Active_Matrix_Using_a_Roll-to-Roll_Gravure/5406154
10.1021/acsomega.7b00873.s001