文摘
A new polythiophene derivative with phenothiazine-vinylene (PTZV) conjugated side chains,PTZV-PT, was synthesized through the Stille coupling reaction and characterized by 1H NMR, elemental analysis,GPC, TGA, DSC, UV-vis absorption spectroscopy, photoluminescence spectroscopy, and cyclic voltammetry.The polymer is soluble in common organic solvents and possesses good thermal stability with 5% weight loss atthe temperature of 397 C and Tg of 140 C. The weight-average molecular weight of PTZV-PT was 5.45 ×104 with the polydispersity index of 1.48. The absorption spectrum of PTZV-PT film displays a broad plateaubetween 300 and 600 nm. The hole mobility of PTZV-PT determined from space-charge-limited current modelwas 4.7 × 10-3 cm2 V-1 s-1. The field effect hole mobility of the polymer reached 6.8 × 10-3 cm2 V-1 s-1 withan on/off ratio of 2.5 × 104, which is among the best performance of the regiorandom polymers for the solution-processed organic field effect transistors (OFETs). The preliminary results indicate that PTZV-PT is a promisingpolymer material for applications in solution-processable OFETs.