A solution-processable star-shaped molecule for high-performance organic solar cells via alkyl chain engineering and solvent additive

J. Min, Y.N. Luponosov, T. Ameri, A. Elschner, S.M. Peregudova, D. Baran, T. Heumüller, N. Li, F. MacHui, S. Ponomarenko, C.J. Brabec

Research output: Contribution to journalArticlepeer-review

Abstract

A new star-shaped D-π-A molecule, tris4-[5′′-(1,1- dicyanobut-1-en-2-yl)-2,2′-bithiophen-5-yl]phenylamine N(Ph-2T-DCN-Et)3, with high efficiency potential for photovoltaic applications was synthesized. As compared to its analogue S(TPA-bT-DCN), it showed stronger absorption in the region of 350-450 nm and a lower lying highest occupied molecular energy level (HOMO). Solution-processed organic solar cells (OSCs) based on a blend of N(Ph-2T-DCN-Et)3 and PC70BM resulted in a high PCE of 3.1% without any post-treatment. The PCE of N(Ph-2T-DCN-Et)3 based solar cells was further improved to 3.6% under simulated AM 1.5 by addition of a new additive 4-bromoanisole (BrAni). © 2012 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)219-229
Number of pages11
JournalOrganic Electronics
Volume14
Issue number1
DOIs
Publication statusPublished - 2013

Keywords

  • Cell engineering
  • Molecules
  • Organic solar cells
  • Stars
  • Synthesis (chemical)
  • 4-Bromoanisole (BrAni)
  • High-efficiency
  • Molecular energy levels
  • Photovoltaic applications
  • Solution processable
  • Solution-processed
  • Solvent additives
  • Star-shaped molecules
  • Solar cells

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