Hole mobility enhancement by chain alignment in nanoimprinted poly„3-hexylthiophene... nanogratings for organic electronics

The authors report that the poly 3-hexylthiophene-2,5-diyl P3HT nanogratings shaped by nanoimprint lithography show enhanced hole mobility and strong anisotropy of conductance due to nanoimprint-induced three-dimensional polymer chain alignment. Field effect transistors were fabricated using these nanogratings and device measurements show a hole mobility of 0.03 cm2 /V s along the grating direction, which is about 60 times higher than that of nonoptimized thin film transistors. Organic photovoltaic devices OPV were made using the P3HT nanograting with infiltration of 6,6 -phenyl-C61-butyric acid methyl ester. Compared to similar bilayer and bulk heterojunction devices, the nanoimprinted OPV shows improved device performance. © 2010 American Vacuum Society. DOI: 10.1116/1.3501343