Macromolecular Research, Vol.17, No.7, 491-498, July, 2009
New Semiconducting Multi-branched Conjugated Molecules Bearing 3,4-Ethylenedioxythiophene-based Thiophenyl Moieties for Organic Field Effect Transistor
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New π-conjugated multi-branched molecules were synthesized through the Horner-Emmons reaction using alkyl-substituted, 3,4-ethylenedioxythiophene-based, thiophenyl aldehydes and octaethyl benzene-1,2,4,5-tetrayltetrakis(methylene) tetraphosphonate as the core unit; these molecules have all been fully characterized. The two multi-branched conjugated molecules exhibited excellent solubility in common organic solvents and good selffilm forming properties. The semiconducting properties of these multi-branched molecules were also evaluated in organic field-effect transistors (OFET). With octyltrichlorosilane (OTS) treatment of the surface of the SiO2 gate insulator, two of the crystalline conjugated molecules, 7 and 8, exhibited carrier mobilities as high as 2.4 (± 0.5)×10^(-3) and 1.3 (± 0.5)×10^(-3) cm2V^(-1)s^(-1), respectively. The mobility enhancement of OFET by light irradiation (λ = 436 nm) supported the promising photo-controlled switching behavior for the drain current of the device.
Keywords:conjugated semiconductor;multi-branched molecule;mobility;organic field effect transistor;organic phototransistor.
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