Donor-acceptor copolymers incorporating polybenzo [1,2-b:4,5-b0]dithiophene and tetrazine for high open circuit voltage polymer solar cells

Weidong Cheng, Zhenghui Wu, Shanpeng Wen, Bin Xu, Hui Li, Fu Rong Zhu, Wenjing Tian*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

30 Citations (Scopus)

Abstract

Two new low band gap conjugated polymers containing a benzo[1,2-b:4,5-b0] dithiophene donor unit and a tetrazine acceptor unit were synthesized by Stille cross-coupling polymerization. The structural and thermal properties of copolymers were characterized using nuclear magnetic resonance, gel permeation chromatography and thermogravimetric analysis. The results show that the donor-acceptor copolymers thus developed have good thermal stability with decomposition temperature of 294 °C and 305 °C. Cyclic voltammetric study revealed that the copolymers possess a deep-lying highest occupied molecular orbital energy level, which is desired for high open circuit voltage polymer solar cells (PSCs) and is also favorable for stable device operation in air. Bulk-heterojunction PSCs basedon blend of low band gap copolymers: [6,6]-phenyl-C71-butyric acid methyl ester on indium tin oxide/glass substrates were fabricated. This work yielded a promising power conversion efficiency of >5.0%, with a high open circuit voltage of ∼1.0 V, measured under air mass 1.5 global irradiation of 100 mW/cm2. Crown

Original languageEnglish
Pages (from-to)2124-2131
Number of pages8
JournalOrganic Electronics
Volume14
Issue number9
DOIs
Publication statusPublished - Sept 2013

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

User-Defined Keywords

  • Donor-acceptor copolymers
  • High open circuit voltage
  • Polymer solar cells
  • Solution-process

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