期刊
ACS MACRO LETTERS
卷 2, 期 8, 页码 664-669出版社
AMER CHEMICAL SOC
DOI: 10.1021/mz400164s
关键词
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资金
- Department of Energy Office of Basic Energy Sciences [DE-FG02-07ER46465]
- NSF, Division of Materials Research [0905176]
- NSF MRSEC Research Experiences for Undergraduates program
- National Research Foundation of Korea (NRF) [2013020225]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0905176] Funding Source: National Science Foundation
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'-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 x 10(-4) cm(2) V-1 s(-1) with on/off ratio of 10(3) 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 -40 mu 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.
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