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Title
Formation of Nanopatterned Polymer Blends in Photovoltaic Devices
Article in journal
Authors
Ximin He, Feng Gao, Guoli Tu, David Hasko, Sven Huettner, Ullrich Steiner, Neil C. Greenham, Richard H. Friend, Wilhelm T. S. Huck
Publication Year
2010
Source
Nano letters (Print), 2010, (10)4, 1302-1307
Link to Source (DOI)
10.1021/nl904098m
Abstract
<p>In this paper, we demonstrate a double nanoimprinting process that allows the formation of nanostructured polymer heterojunctions of composition and morphology that can be selected independently. We fabricated photovoltaic (PV) devices with extremely high densities (10(14)/mm(2)) of interpenetrating nanoscale columnar features in the active polymer blend layer. The smallest feature sizes are as small as 25 nm on a 50 nm pitch, which results in a spacing of hererojunctions at or below the exciton diffusion length. Photovoltaic devices based on double-imprinted poly((9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole]-2,2 diyl) (F8TBT)/poly(3-hexylthiophene) (P3HT) films are among the best polymer polymer blend devices reported to date with a power conversion efficiency (PCE, eta(e)) of 1.9%.</p>