Formation of nanopatterned polymer blends in photovoltaic devices

  • He X
  • Gao F
  • Tu G
 et al. 
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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 heterojunctions 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%.

Author-supplied keywords

  • Nanoimprint lithography
  • Nanoscale morphology
  • Polymer blends
  • Polymer photovoltaics

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  • Ximin He

  • Feng Gao

  • Guoli Tu

  • David Hasko

  • Sven Hüttner

  • Ullrich Steiner

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