Suppressing charge recombination by incorporating 3,6-carbazole into poly[9-(heptadecan-9-yl)-9H-carbazole-2,7-diyl-alt-(5,6-bis-(octyloxy)-4, 7-di(thiophen-2-yl)benzo[1,2,5]-thiadiazole)-5,5-diyl]

Gang Young Lee, Byung Joon Moon, Seulki Song, Won Ho Lee, Han Young Woo, Taiho Park

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A series of poly[9-(heptadecan-9-yl)-9H-carbazole-2,7-diyl-alt-(5,6-bis- (octyloxy)-4,7-di(thiophen-2-yl)benzo-[1,2,5]-thia-diazole)-5,5-diyl] compositions containing various ratios of 3,6-carbazole was synthesized for testing in a polymer solar cell. An appropriate amount of 3,6-carbazole units incorporated into the copolymer improved intermolecular charge transport, whereas excess amount of 3,6-carbazole units temporarily seized on the partial negative charge generated in the conjugation breaks. We extensively studied the effects of the incorporated 3,6-carbazole units on the intermolecular interactions, which can affect nongeminated recombination in bulk heterojunction-polymer solar cells. These properties were investigated using photocurrent- and light intensity-dependent measurements and electrochemical impedance spectroscopy.

Original languageEnglish
Pages (from-to)2047-2056
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume52
Issue number14
DOIs
Publication statusPublished - 2014 Jul 15
Externally publishedYes

Keywords

  • -carbazole
  • A3
  • charge recombination
  • charge transport
  • conducting polymers
  • conjugation break
  • copolymerization
  • intermolecular interaction
  • photovoltaic

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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