American Chemical Society
nl901232p_si_001.pdf (1.1 MB)

Photonic Crystal Geometry for Organic Solar Cells

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journal contribution
posted on 2009-07-08, 00:00 authored by Doo-Hyun Ko, John R. Tumbleston, Lei Zhang, Stuart Williams, Joseph M. DeSimone, Rene Lopez, Edward T. Samulski
We report organic solar cells with a photonic crystal nanostructure embossed in the photoactive bulk heterojunction layer, a topography that exhibits a 3-fold enhancement of the absorption in specific regions of the solar spectrum in part through multiple excitation resonances. The photonic crystal geometry is fabricated using a materials-agnostic process called PRINT wherein highly ordered arrays of nanoscale features are readily made in a single processing step over wide areas (∼4 cm2) that is scalable. We show efficiency improvements of ∼70% that result not only from greater absorption, but also from electrical enhancements. The methodology is generally applicable to organic solar cells and the experimental findings reported in our manuscript corroborate theoretical expectations.