Pyromellitic Diimide鈥揈thynylene-Based Homopolymer Film as an N-Channel Organic Field-Effect Transistor Semiconductor

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• 作者：Srinivas Kola ; Joo Hyun Kim ; Robert Ireland ; Ming-Ling Yeh ; Kelly Smith ; Wenmin Guo ; Howard E. Katz
• 刊名：ACS Macro Letters
• 出版年：2013
• 出版时间：August 20, 2013
• 年：2013
• 卷：2
• 期：8
• 页码：664-669
• 全文大小：364K
• 年卷期：v.2,no.8(August 20, 2013)
• ISSN：2161-1653

文摘

We report the synthesis and characterization of two solution-processable pyromellitic diimide (PyDI)-acetylene-based conjugated homopolymers. Adjacent PyDI cores were connected with triple bond linkages by reacting 3,6-dibromo-N,N鈥?dialkyl pyromellitic diimides with bis(tributylstannyl)acetylene under Stille coupling conditions. Cyclic voltammetry revealed that these polymers have sufficient electron affinity to accept electrons. Absorption spectra revealed that one polymer, with a simple octyl chain, has greater intermolecular interaction or conjugation after forming a thin film, and that film exhibited electron transport in top-gate bottom-contact mode organic field-effect transistor (OFET) devices. X-ray diffraction (XRD) and atomic force microscopy (AFM) results show that the octyl polymer is amorphous on the bulk scale. The polymer exhibited electron mobility of about 2 脳 10^鈥? cm² V^鈥? s^鈥? with on/off ratio of 10³ and is the simplest n-channel polymer yet reported. A 4-trifluoromethylphenethyl side chain did not result in measurable electron mobility. The octyl polymer exhibited negative Seebeck coefficient on the order of 鈭?0 渭V/K in thermoelectric devices, further substantiating its n-channel activity. The demonstration of electron transport from such a simple polymer has opened a new path for obtaining n-channel semiconducting activity from polymer films.