Comprehensive study of pyrido[3,4-b]pyrazine-based D-π-a copolymer for efficient polymer solar cells

Yu Qi Wu, Hsieh Chih Chen, Yun Siou Yang, Sheng Hsiung Chang, Pin Jiun Wu, Yen Yi Chu, Chun Guey Wu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Two D-π-A copolymers, based on the benzo[1,2-b:4,5-b′]-dithiophene (BDT) as a donor unit and benzo-quinoxaline (BQ) or pyrido-quinoxaline (PQ) analog as an acceptor (PBDT-TBQ and PBDT-TPQ), were designed and synthesized as a p-type material for bulk heterojunction (BHJ) photovoltaic cells. When compared with the PBDT-TBQ polymer, PBDT-TPQ exhibits stronger intramolecular charge transfer, showing a broad absorption coverage at the red region and narrower optical bandgap of 1.69 eV with a relatively low-lying HOMO energy level at -5.24 eV. The experimental data show that the exciton dissociation efficiency of PBDT-TPQ:PC71BM blend is better than that in the PBDT-TBQ:PC71BM blend, which can explain that the IPCE spectra of the PBDT-TPQ-based solar cell were higher than that of the PBDT-TBQ-based solar cell. The maximum efficiency of PBDT-TPQ-based device reaches 4.40% which is much higher than 2.45% of PBDT-TBQ, indicating that PQ unit is a promising electron-acceptor moiety for BHJ solar cells.

Original languageEnglish
Pages (from-to)1822-1833
Number of pages12
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume54
Issue number12
DOIs
StatePublished - 15 Jun 2016

Keywords

  • bulk heterojunction
  • quinoxaline
  • solar cells
  • structure-function relationship
  • time-resolved photoluminescence

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