Synthesis and characterization of novel low-bandgap triphenylamine-based conjugated polymers with main-chain donors and pendent acceptors for organic photovoltaics

Duryodhan Sahu, Harihara Padhy, Dhananjaya Patra, Jen Hsien Huang, Chih Wei Chu, Hong-Cheu Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

A series of novel low-bandgap triphenylamine-based conjugated polymers (PCAZCN, PPTZCN, and PDTPCN) consisting of different electron-rich donor main chains (N-alkyl-2,7-carbazole, phenothiazine, and cyclopentadithinopyrol, respectively) as well as cyano- and dicyano-vinyl electron-acceptor pendants were synthesized and developed for polymer solar cell applications. The polymers covered broad absorption spectra of 400-800 nm with narrow optical bandgaps ranging 1.66-1.72 eV. The highest occupied molecular orbital and lowest unoccupied molecular orbital levels of the polymers measured by cyclic voltammetry were found in the range of -5.12 to -5.32 V and -3.45 to -3.55 eV, respectively. Under 100 mW/cm2 of AM 1.5 white-light illumination, bulk heterojunction photovoltaic devices composing of an active layer of electron-donor polymers (PCAZCN, PPTZCN, and PDTPCN) blended with electron-acceptor [6,6]-phenyl-C61-butyric acid methyl ester or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) in different weight ratios were investigated. The photovoltaic device containing donor PCAZCN and acceptor PC71BM in 1:2 weight ratio showed the highest power conversion efficiency of 1.28%, with Voc = 0.81 V, Jsc = 4.93 mA/cm2, and fill factor = 32.1%.

Original languageEnglish
Pages (from-to)5812-5823
Number of pages12
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume48
Issue number24
DOIs
StatePublished - 15 Dec 2010

Keywords

  • bulk heterojunction
  • conducting polymers
  • conjugated polymers
  • donor-acceptor
  • heteroatom-containing polymers
  • low bandgap
  • polymer solar cells
  • synthesis
  • triphenylamine derivatives

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