Bithiophene imide and benzodithiophene copolymers for efficient inverted polymer solar cells

Nanjia Zhou, Xugang Guo, Rocio Ponce Ortiz, Shiqiang Li, Shiming Zhang, Robert P.H. Chang, Antonio Facchetti, Tobin J. Marks

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138 Citations (Scopus)


Bithiophene imide (BTI) and benzodithiophene (BDT) copolymers are synthesized for application in organic photovoltaic (OPV) cells. The electron deficiency of the BTI units leads to polymers with a low-lying HOMOs (5.6 eV). Inverted solar cells are fabricated to investigate the OPV performance of the BTI-based polymers and achieve power conversion efficiencies up to 5.5%, with substantial V ocs above 0.9 V which are among the highest V ocs reported to date for polymer/PCBM solar cells. The results indicate that the BTI is a promising building block for constructing polymer donors for OPV applications.

Original languageEnglish
Pages (from-to)2242-2248
Number of pages7
JournalAdvanced Materials
Issue number17
Publication statusPublished - May 2 2012



  • donor-acceptor polymers
  • imide-based polymers
  • metal oxides
  • morphology
  • organic photovoltaic cells

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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