Synthesis and characterization of a thiadiazole/benzoimidazole-based copolymer for solar cell applications

Guan Yu Chen, Shang Che Lan, Po Yu Lin, Chih Wei Chu, Kung-Hwa Wei*

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

In this study, we synthesized a new polymer, PCTDBI, containing alternating carbazole and thiadiazole-benzoimidazole (TDBI) units. This polymer (number-average molecular weight = 25,600 g mol-1), which features a planar imidazole structure into the polymeric main chain, possesses reasonably good thermal properties (Tg = 105 °C; Td = 396 °C) and an optical band gap of 1.75 eV that matches the maximum photon flux of sunlight. Electrochemical measurements revealed an appropriate energy band offset between the polymer's lowest unoccupied molecular orbital and that of PCBM, thereby allowing efficient electron transfer between the two species. A solar cell device incorporating PCTDBI and PCBM at a blend ratio of 1:2 (w/w) exhibited a power conversion efficiency of 1.20%; the corresponding device incorporating PCTDBI and PC71BM (1:2, w/w) exhibited a PCE of 1.84%.

Original languageEnglish
Pages (from-to)4456-4464
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume48
Issue number20
DOIs
StatePublished - 15 Oct 2010

Keywords

  • carbazole
  • conjugated polymer
  • copolymerization
  • heteroatom-containing polymers
  • imidazole
  • solar cell

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