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11 September 2008 Characterizing enhanced performance of nanopatterned bulk heterojunction organic photovoltaics
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We present experimental and theoretical studies of a nanopatterned photonic crystal formed between the bulk heterojunction blend, poly-3-hexylthiophene:[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) and nanocrystalline zinc oxide (nc-ZnO). The nanopattern is fabricated using the Pattern Replication in Non-wetting Templates (PRINT) technique. We summarize the fabrication method and show how it can be used to make a highly ordered hexagonal array of photovoltaic P3HT:PCBM posts. We also discuss theoretical studies of optical absorption for the nanopattern design that result in a 22% enhancement over a conventional planar cell. Spectroscopic ellipsometry is also used to determine the optical constants of solar cell materials that are used in the optical model. Finally, we calculate the local exciton creation profile within the photoactive nanopattern to relate the nanostructured geometry to electrical performance.
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John R. Tumbleston, Doo-Hyun Ko, Rene Lopez, and Edward T. Samulski "Characterizing enhanced performance of nanopatterned bulk heterojunction organic photovoltaics", Proc. SPIE 7047, Nanoscale Photonic and Cell Technologies for Photovoltaics, 70470S (11 September 2008);

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