MELE, E. ... et al, 2012. Enhanced charge-carrier mobility in polymer nanofibers realized by solvent-resistant soft nanolithography. Journal of Materials Chemistry, 22 (34), pp. 18051 - 18056.
We realize nanofibers of regioregular poly(3-hexylthiophene) (P3HT) by solvent-resistant nanolithography and use them as the active medium in organic field effect transistors. This process favors a remarkable improvement of the device performances, since we exploit the nanofluidic flow in perfluoropolyether capillaries and the slow solvent evaporation rate in the mold cavities to induce the reorganization of the P3HT chains and obtain a charge carrier mobility 60 times higher than in the corresponding homogenous films. The precise control of the structure cross-section (sub-100 nm) and of the spatial arrangement on the transistor electrodes is very promising for the development of one-dimensional (1D) nanostructures of conjugated materials with high field-effect mobility, applicable to miniaturized optoelectronic devices.
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This work is performed in the framework of the FIRB
RBFR08DJZI ‘‘Futuro in Ricerca’’ and partially supported by
the SEED project "X-ray synchrotron class rotating anode
microsource for the structural micro imaging of nanomaterials
and engineered biotissues (XMI-LAB)" – IIT Protocol no. 21537