Fabrication of Flexible and Printable Organic Thin-Film Transistor-based Sensor

As the next generation technology, organic thin-film transistor (OTFT) is fully desired in manufacturing flexible electronics due to its’ mechanically strong property and low-temperature processing at large-scale production. In this work, OTFT device using poly(3,4-ethylene dioxythiophene) polystyrene sulfonate (PEDOT:PSS) is successfully fabricated on a flexible film by screen printing and drop casting technique at maximum process temperature of 80 °C. A For such straightforward deposition techniques, the device demonstrated a potentially good reproducibility and repeatability. Moreover, a significant property is observed on the device’s current-voltage (I-V) performance that shows the average output source current is larger by ~4.4 times at maximum when dielectric reduce from ~24.04 µm to ~13.87 µm. The implementation of extended gate and reference electrode further enable detection in phosphate buffered saline (PBS) with small hysteresis. Eventually, the flexibility and printability of the fabricated OTFT raised the opportunity of low-cost application such as disposable biosensor to detect specific analyte at a small volume of solution.