Efficient solar cells are more stable: the impact of polymer molecular weight on performance of organic photovoltaics

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

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Dangosydd eitem ddigidol (DOI)

  • Ziqian Ding
  • Jeffrey Kettle
  • M. Horie
    National Tsing Hua University
  • S.M. Chang
    National Tsing Hua University
  • G.C. Smith
    University of Chester
  • A. I. Shames
    Ben-Gurion University of the Negev
  • E. A. Katz
    Ben-Gurion University of the Negev
The principle remaining challenge in the research area of organic photovoltaic (OPV) materials is to develop solar cells that combine high efficiency, stability and reproducibility. Here, we demonstrate an experimental strategy which has successfully addressed this challenge. We produced a number of samples of the highly efficient PTB7 polymer with various molecular weights (Mn ∼ 40–220k). OPV cells fabricated with this polymer demonstrated significant improvement of the cell efficiency (by ∼90% relative) and lifetime (by ∼300% relative) with the Mn increase. We attribute these effects to the lower density of recombination centers (persistent radical defects revealed by EPR spectroscopy) and better photoactive layer morphology in the samples with higher Mn. Relevance of the observed correlation between the OPV efficiency and stability is discussed.
Iaith wreiddiolSaesneg
Tudalennau (o-i)7274-7280
CyfnodolynJournal of Materials Chemistry A
Rhif y cyfnodolyn19
Dyddiad ar-lein cynnar14 Ebr 2016
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 21 Mai 2016

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