Photovoltaic properties of benzotriazole containing alternating donor-acceptor copolymers: Effect of alkyl chain length

Derya Baran*, Abidin Balan, Tobias Stubhan, Tayebeh Ameri, Levent Toppare, Christoph J. Brabec

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

A series of variable alkyl chain length substituted donor-acceptor (D-A) conjugated polymers with thiophene ring as the donor and benzotriazole moiety as the acceptor has been investigated in bulk heterojunction solar cells. The optical and electrochemical properties showed that the absorption onsets and the energy levels of the copolymers were not affected by alkyl substitution revealing 1.9 eV of optical band gap. The morphologies of the blend film can be fine-tuned by increasing the chain length attached to the benzotriazole unit. Photovoltaic devices were fabricated using (6,6)-phenyl-C61-butyric acid methyl ester (PC60BM) and (6,6)-phenyl-C71-butyric acid methyl ester (PC70BM) as the acceptors. The maximum performance was achieved with a Voc of 0.75 V, Jsc of 3.70 mA/cm 2, FF of 45% and a PCE of 1.23% for the PTBT-DA10:PC70BM device using 1:4 w/w ratio in chlorobenzene (CB).

Original languageEnglish (US)
Pages (from-to)2047-2051
Number of pages5
JournalSynthetic Metals
Volume162
Issue number23
DOIs
StatePublished - Dec 1 2012

Keywords

  • Benzotriazole
  • Donor-acceptor polymers
  • Effect of chain length
  • Organic photovoltaics
  • Solar cell

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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