Nanostructure Dependence of Field-Effect Mobility in Regioregular Poly(3-hexylthiophene) Thin Film Field Effect Transistors
Journal of the American Chemical Society2006Vol. 128(11), pp. 3480–3481
Citations Over TimeTop 1% of 2006 papers
Rui Zhang, Bo Li, Mihaela C. Iovu, Malika Jeffries‐EL, Geneviève Sauvé, Jessica Cooper, Shijun Jia, Stephanie Tristram‐Nagle, Detlef‐M. Smilgies, D.N. Lambeth, Richard D. McCullough, Tomasz Kowalewski
Abstract
Low polydispersity regioregular polythiophenes with number average molecular weights ranging from 2 to 13 kDa were cast under the same conditions from solution to form a series of field effect transistors (FETs). Tapping mode AFM and grazing incidence small-angle X-ray scattering revealed that in all cases the polymers formed regular nanofibrillar morphologies with the width of nanofibrils proportional to the weight average contour length of polymer chains, indicating that conjugated backbones were oriented perpendicular to the nanofibril axes. FET charge carrier mobilities exhibited exponential dependence on nanofibril width, pointing to the decisive role of extended conjugated pathways in charge transport.
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