5,10-dihydroindolo[3,2-b]indole-based copolymers with alternating donor and acceptor moieties for organic photovoltaics

Zbyslaw R. Owczarczyk*, Wade A. Braunecker, Andres Garcia, Ross Larsen, Alexandre M. Nardes, Nikos Kopidakis, David S. Ginley, Dana C. Olson

*Corresponding author for this work

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

A series of new donor-acceptor π-conjugated copolymers incorporating 5,10-dihydroindolo[3,2-b]indole (DINI) as an electron donating unit have been designed, synthesized, and explored in bulk heterojunction solar cells with diketopyrrolopyrrole and thienopyrroledione as the electron accepting units. A significant effect of the size and shape of the pendant alkyl substituents attached to the DINI unit on the optical and electronic properties of the copolymers is described. Our study reveals a good correlation between the theoretical calculations performed on the selected materials and the experimental HOMO, LUMO, absorption spectra, and band gap energies of the corresponding copolymers. The band gaps of the conjugated copolymers can be tailored over 0.4 eV by the electron-withdrawing nature of the different acceptor units to provide better overlap with the solar spectrum, and the energy levels can be tuned ∼0.2 eV depending on the alkyl substituents employed. For the polymers in this study, a nonoptimized power conversion efficiency as high as 3% was observed.

Original languageEnglish
Pages (from-to)1350-1360
Number of pages11
JournalMacromolecules
Volume46
Issue number4
DOIs
Publication statusPublished - 26 Feb 2013
Externally publishedYes

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