Formation of nanopatterned polymer blends in photovoltaic devices

Ximin He, Feng Gao, Guoli Tu, David Hasko, Sven Hüttner, Ullrich Steiner, Neil C. Greenham, Richard H. Friend, Wilhelm T.S. Huck

Research output: Contribution to journalArticlepeer-review

193 Scopus citations

Abstract

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 (1014/mm2) 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, ηe) of 1.9%.

Original languageEnglish (US)
Pages (from-to)1302-1307
Number of pages6
JournalNano Letters
Volume10
Issue number4
DOIs
StatePublished - Apr 14 2010

Keywords

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

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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