Polythiophene Derivative with Phenothiazine-Vinylene Conjugated Side Chain: Synthesis and Its Application in Field-Effect Transistors

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• 作者：Yingping Zou ; Weiping Wu ; Guangyi Sang ; Yi Yang ; Yunqi Liu ; Yongfang Li
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：October 2, 2007
• 年：2007
• 卷：40
• 期：20
• 页码：7231 - 7237
• 全文大小：157K
• 年卷期：v.40,no.20(October 2, 2007)
• ISSN：1520-5835

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 T_g 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.