Transistor Paint: Environmentally Stable N‐alkyldithienopyrrole and Bithiazole‐Based Copolymer Thin‐Film Transistors Show Reproducible High Mobilities without Annealing

Abstract

New solution processable 4‐(2‐hexyldecan)‐4H‐bisthieno[2,3‐d:3′,2′‐b]pyrrole and 4,4′‐dialkyl‐2,2′‐bithiazole‐based copolymers (PBTzDTPs) are synthesized with excellent FET performance. These novel copolymers have considerable potential in printable electronics as they have high charge carrier mobilities, excellent air stability, good solution processibility, and no requirement for post‐deposition thermal annealing, all requirements for this field of application. The thin film transistors fabricated from PBTzDTPs achieve field effect mobilities as high as 0.14 cm2 V−1 s−1 with current on/off ratios up to 106 without thermal annealing. In addition, the devices exhibit stable performance in air, showing no significant degradation over 60 days. Moreover, the polymers described here provide an excellent example of the systems in which higher mobility performance does not require higher crystalline, long‐range ordered structures. Such a system appears to be particularly promising for rapid fabrication techniques, where kinetic conditions usually prevent the development of long‐range order.

Ordered Materials for Organic Electronics and Photonics

“…[ 37 , 38 ] A similar result was obtained on a 3% strained polyimide substrate, which demonstrates the suitabilty of smectic compounds for fl exible plastic electronics. [ 39 ] Photoalignment has been used to align a phenylenethiophene molecule, compound 12 , with a high-temperature smectic phase. The magnitude of the mobility was enhanced when the direction of electronic transport was parallel to the direction of the intermolecular hops (perpendicular to the molecular rods).…”

Thiadizoloquinoxaline-Based Low-Bandgap Conjugated Polymers as Ambipolar Semiconductors for Organic Field Effect Transistors

“…On the other hand, smoother polymer films provide a higher uniformity due to smaller grain microstructures and finally higher charge carrier mobilities. 49 This may be a reason why PBDTTQ-3 has a higher mobility than PAPhTQ.…”

Recent advances in high mobility donor–acceptor semiconducting polymers

“…5 It has recently been demonstrated that both highly polar diketopyrrolopyrrole (DPP) and benzothiadiazole (BT) containing donoracceptor polymers are able to afford even higher carrier mobilities, 6,7,8 despite having apparently less ordered microstructures, and functional groups that have previously been expected to potentially act as charge traps. These results suggest that one dimensional charge transport along the polymer chains may dominate in these low ordered systems.…”