Tuning the polarizability in donor polymers with a thiophenesaccharin unit for organic photovoltaic applications

Tao Xu, Luyao Lu, Tianyue Zheng, Jodi M. Szarko, Alexander Schneider, Lin X. Chen*, Luping Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

This paper describes the synthesis of low bandgap copolymers incorporating an artificial sweetener derivative, N-alkyl, 3-oxothieno[3,4-d]isothiazole 1,1-dioxide (TID). This new TID unit is identical to the well-known thieno[3,4-c]pyrrole-4,6-dione (TPD) unit except that one carbonyl has been replaced by a sulfonyl group. Semi-empirical calculations on the local dipole moment change between ground and excited states (Δμge) in the repeating units of the new polymer indicate that the replacement of the carbonyl by a sulfonyl group leads to larger Δμge values. The resulting polymers exhibit a diminished power-conversion efficiency (PCE) compared to a bulk heterojunction (BHJ) solar cells with PC71BM as an acceptor, which extends the correlation between PCE and Δμ ge of single repeating units in p-type polymers to a new regime. Detailed studies show that the strongly electron-withdrawing sulfonyl group is detrimental to charge separation in alternating copolymers containing a TID unit.

Original languageEnglish (US)
Pages (from-to)3432-3437
Number of pages6
JournalAdvanced Functional Materials
Volume24
Issue number22
DOIs
StatePublished - Jun 11 2014

Keywords

  • low bandgap polymers
  • organic photovoltaics
  • polymers
  • solar cells
  • structure-property relationships

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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