Manufacture of organic transistors on large‐area flexible substrate using direct imaging exposure system by wet process suitable for roll‐to‐roll production

Organic thin‐film transistors (OTFTs) can be fabricated via a wet process and have exceptionally high flexibility. Therefore, production using the roll‐to‐roll (RtoR) method is expected. We succeeded in developing a new OTFT wet fabrication process adaptable to the RtoR process. Utilizing the electroless plating method for wiring formation, all materials can be formed in a wet process and can be patterned using the photolithography process. In addition, we succeeded in fabricating OTFT on an A4‐type flexible substrate using RtoR direct imaging exposure system. This photo is organic thin‐film transistor active matrix circuit fabricated on A4‐type flexible substrate. All processes were wet, and electroless plating was used to form the wiring. Material patterning was performed using the RtoR direct imaging exposure system.