Benzooxadiazole-based donor/acceptor copolymers imparting bulk-heterojunction solar cells with high open-circuit voltages

Jian Ming Jiang, Po An Yang, Shang Che Lan, Chia Ming Yu, Kung-Hwa Wei*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

In this study we used Suzuki cross-coupling to synthesize three new donor/acceptor copolymers - PFTBO, PAFTBO, and PCTBO - featuring soluble alkoxy-modified 2,1,3-benzooxadiazole (BO) moieties as acceptor units and electron-rich building blocks - dialkyl fluorene (F), alkylidene fluorene (AF), and carbazole (C), respectively - as donor units. These polymers, which we characterized using gel permeation chromatography, thermogravimetric analysis, NMR spectroscopy, UV-Vis absorption spectroscopy, and electrochemical cyclic voltammetry, exhibited good solubility, low-lying energy levels for their highest occupied molecular orbitals, excellent thermal stability, and air stability. Using these polymers, we fabricated bulk-heterojunction solar cell devices having the structure indium tin oxide/poly(3,4-ethylenedioxythiophene): polystyrenesulfonate/polymer:[6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) (1:1, w/w)/Ca/Al. Under AM 1.5G illumination (100 mW cm-2), the solar cell incorporating PFTBO exhibited a high value of Voc of 1.04 V and that based on PCTBO provided a power conversion efficiency of 4.1% without the need for any post treatment.

Original languageEnglish
Pages (from-to)155-161
Number of pages7
JournalPolymer
Volume54
Issue number1
DOIs
StatePublished - 8 Jan 2013

Keywords

  • Donor/acceptor conjugated polymers
  • Polymer solar cell
  • Suzuki coupling

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