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Journal Article Solution-Processable Field-Effect Transistor Using a Fluorene- and Selenophene-Based Copolymer as an Active Layer
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Authors
Young Mi Kim, Eun Hee Lim, In Nam Kang, Byung Jun Jung, Jae Min Lee, Bon Won Koo, Lee Mi Do, Hong Ku Shim
Issue Date
2006-06
Citation
Macromolecules, v.39, no.12, pp.4081-4085
ISSN
0024-9297
Publisher
American Chemical Society(ACS)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1021/ma060567l
Abstract
We have synthesized a new p-type polymer, poly(9,9??-n- dioctylfluorene-alt-biselenophene) (F8Se2), via the palladium-catalyzed Suzuki coupling reaction. The number-average molecular weight (Mn) of F8Se2 was found to be 72 600. F8Se2 dissolves in common organic solvents such as chloroform and chlorobenzene. The PL emission peak of a film of F8Se2 is clearly red-shifted with respect to that of its sulfur analogue, poly(9,9??-n- dioctylfluorene-alt-bithiophene) (F8T2), due to the electron-donating properties of selenium and the strong interactions between the biselenophene moieties in neighboring copolymer chains. We confirmed that F8Se2 is a thermotropic liquid crystalline polymer with an aligned structure by carrying out DSC, PLM, and XRD measurements. The introduction of the selenophene moiety into the liquid-crystalline polymer system results in better field-effect transistor (FET) performance than that of F8T2. A solution-processed F8Se2 FET device with a bottom contact geometry was found to exhibit a hole mobility of 0.012 cm 2/(V s) and a low threshold voltage of -4 V, which is the one of the highest solution-processable FET performances. © 2006 American Chemical Society.
KSP Keywords
Active Layer, Aligned structure, Bottom contact, Contact geometry, Emission peak, FET devices, Field-effect transistors(FETs), Hole mobility, Liquid-crystalline polymer(LCP), Number-average molecular weight, PL emission