Low-Temperature Processed Flexible In–Ga–Zn–O Thin-Film Transistors Exhibiting High Electrical Performance

In-Ga-Zn-O thin-film transistors processed at 150°C on laminated polyethylene naphthalate substrates exhibit ing high electrical performances such as a saturation mobility of 24.26 cm²/(V · s), a subthreshold slope of 140 mV/dec, a turn-on voltage V_on of -0.41 V, and an on-off ratio of 1.8 × 10⁹ were fabricated. Cool-off-type adhesive was adopted to easily detach the plastic substrate from the carrier holder. Devices also showed highly uniform characteristics with a variation of 0.09 V in turn-on voltage. Stability characteristics under the positive gate bias stress can be enhanced by increasing the annealing time at 150°C.