Effect of P3HT: TIPS-pentacene blend on properties of OFETs

Since their discovery, organic field-effect transistors (OFETs) have garnered significant interest for applications in flexible displays, sensor arrays, and portable bio-electronics. Solution-processable OFETs are particularly favored due to their ease of processing and relatively undemanding fabrication environment. In this work, poly(3-hexylthiophene) (P3HT) was used as the organic semiconductor material. However, during solution spin-coating, the polymer molecules tend to form a disorderly, curled state, which hinders the charge carrier transport. Therefore, improving the crystallinity and arrangement order of P3HT molecules is crucial for enhancing the performance of devices. Thin-film transistors based on a blend of TIPS-Pentacene and poly(3-hexylthiophene) (P3HT) were fabricated on SiO 2 insulator layers. Compared with the pristine P3HT devices, the addition of 90 wt.% TIPS-pentacene to the P3HT solution resulted in an approximately fivefold increase in carrier mobility, a reduction in threshold voltage by more than half, a more ordered P3HT molecular chain arrangement, superior molecular crystallinity, and better film quality.