Regioregular oligomer and polymer containing thieno[3,4-b]thiophene moiety for eficient organic solar cells

Yongye Liang, Danqin Feng, Jianchang Guo, Jodi M. Szarko, Claire Ray, Lin X Chen, Luping Yu

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

A regioregular conjugated oligomer (MF) and its polymer counterpart (PF) containing a thieno[3,4-b]thiophene moiety have been developed. The existence of thieno[3,4-b]thiophene extends the absorption of the molecules to longer wavelengths and increases the current density of solar cell devices using these materials. The regioregularity of the polymers from the incorporation of regioregular oligothiophene fragments also enhances hole mobility. Consequently, the polymers show higher solar energy conversion efficiencies in bulk heterojunction (BHJ) solar cells than the low molecular weight oligomers. Spectroscopic and structural studies reveal that composite Films prepared from the polymer exhibit a larger charge carrier density and smaller domain sizes for the electron donor and acceptor than the oligomer counterpart. These results rationalize the origin for the higher solar cell eficiency.

Original languageEnglish (US)
Pages (from-to)1091-1098
Number of pages8
JournalMacromolecules
Volume42
Issue number4
DOIs
StatePublished - Feb 24 2009

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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