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Issue 13, 2014
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Effects of nanostructure geometry on nanoimprinted polymer photovoltaics

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Abstract

We demonstrate the effects of nanostructure geometry on the nanoimprint induced poly(3-hexylthiophene-2,5-diyl) (P3HT) chain alignment and the performance of nanoimprinted photovoltaic devices. Out-of-plane and in-plane grazing incident X-ray diffraction techniques are employed to characterize the nanoimprint induced chain alignment in P3HT nanogratings with different widths, spacings and heights. We observe the dependence of the crystallite orientation on nanostructure geometry such that a larger width of P3HT nanogratings leads to more edge-on chain alignment while the increase in height gives more vertical alignment. Consequently, P3HT/[6,6]-phenyl-C61-butyric-acid-methyl-ester (PCBM) solar cells with the highest density and aspect ratio P3HT nanostructures show the highest power conversion efficiency among others, which is attributed to the efficient charge separation, transport and light absorption.

Graphical abstract: Effects of nanostructure geometry on nanoimprinted polymer photovoltaics

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Publication details

The article was received on 28 Feb 2014, accepted on 21 Apr 2014 and first published on 23 Apr 2014


Article type: Paper
DOI: 10.1039/C4NR01114G
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2014,6, 7576-7584
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    Effects of nanostructure geometry on nanoimprinted polymer photovoltaics

    Y. Yang, K. Mielczarek, M. Aryal, A. Zakhidov and W. Hu, Nanoscale, 2014, 6, 7576
    DOI: 10.1039/C4NR01114G

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