Benzoyl side-chains push the open-circuit voltage of PCDTBT/PCBM solar cells beyond 1 V

Florian Lombeck, Stefan Müllers, Hartmut Komber, S. Matthew Menke, Andrew J. Pearson, Patrick J. Conaghan, Christopher R. McNeill, Richard H. Friend, Michael Sommer

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The synthesis, characterization and solar cell performance of PCDTBT and its highly soluble analogue hexyl-PCDTBT with cross-conjugated benzoyl moieties at the carbazole comonomer are presented. Through the use of both model reactions and time-controlled microwave-assisted Suzuki polycondensation, the base-induced cleavage of the benzoyl group from the polymer backbone has been successfully suppressed. Compared to the commonly used symmetrically branched alkyl motif, the benzoyl substituent lowers the energy levels of PCDTBT as well as the band gap, and consequently increases energy of the charge transfer state in blends with PC71BM. As a result, photovoltaic diodes with high-open circuit voltage of above 1 V are realized.

Original languageEnglish
Pages (from-to)142-151
Number of pages10
JournalOrganic Electronics: physics, materials, applications
Volume49
DOIs
Publication statusPublished - 1 Oct 2017

Keywords

  • Benzoyl side chains
  • Conjugated polymers
  • Cross conjugation
  • High open-circuit voltage
  • PCDTBT
  • Solar cells

Cite this

Lombeck, F., Müllers, S., Komber, H., Menke, S. M., Pearson, A. J., Conaghan, P. J., ... Sommer, M. (2017). Benzoyl side-chains push the open-circuit voltage of PCDTBT/PCBM solar cells beyond 1 V. Organic Electronics: physics, materials, applications, 49, 142-151. https://doi.org/10.1016/j.orgel.2017.06.055
Lombeck, Florian ; Müllers, Stefan ; Komber, Hartmut ; Menke, S. Matthew ; Pearson, Andrew J. ; Conaghan, Patrick J. ; McNeill, Christopher R. ; Friend, Richard H. ; Sommer, Michael. / Benzoyl side-chains push the open-circuit voltage of PCDTBT/PCBM solar cells beyond 1 V. In: Organic Electronics: physics, materials, applications. 2017 ; Vol. 49. pp. 142-151.
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abstract = "The synthesis, characterization and solar cell performance of PCDTBT and its highly soluble analogue hexyl-PCDTBT with cross-conjugated benzoyl moieties at the carbazole comonomer are presented. Through the use of both model reactions and time-controlled microwave-assisted Suzuki polycondensation, the base-induced cleavage of the benzoyl group from the polymer backbone has been successfully suppressed. Compared to the commonly used symmetrically branched alkyl motif, the benzoyl substituent lowers the energy levels of PCDTBT as well as the band gap, and consequently increases energy of the charge transfer state in blends with PC71BM. As a result, photovoltaic diodes with high-open circuit voltage of above 1 V are realized.",
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Benzoyl side-chains push the open-circuit voltage of PCDTBT/PCBM solar cells beyond 1 V. / Lombeck, Florian; Müllers, Stefan; Komber, Hartmut; Menke, S. Matthew; Pearson, Andrew J.; Conaghan, Patrick J.; McNeill, Christopher R.; Friend, Richard H.; Sommer, Michael.

In: Organic Electronics: physics, materials, applications, Vol. 49, 01.10.2017, p. 142-151.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Benzoyl side-chains push the open-circuit voltage of PCDTBT/PCBM solar cells beyond 1 V

AU - Lombeck, Florian

AU - Müllers, Stefan

AU - Komber, Hartmut

AU - Menke, S. Matthew

AU - Pearson, Andrew J.

AU - Conaghan, Patrick J.

AU - McNeill, Christopher R.

AU - Friend, Richard H.

AU - Sommer, Michael

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AB - The synthesis, characterization and solar cell performance of PCDTBT and its highly soluble analogue hexyl-PCDTBT with cross-conjugated benzoyl moieties at the carbazole comonomer are presented. Through the use of both model reactions and time-controlled microwave-assisted Suzuki polycondensation, the base-induced cleavage of the benzoyl group from the polymer backbone has been successfully suppressed. Compared to the commonly used symmetrically branched alkyl motif, the benzoyl substituent lowers the energy levels of PCDTBT as well as the band gap, and consequently increases energy of the charge transfer state in blends with PC71BM. As a result, photovoltaic diodes with high-open circuit voltage of above 1 V are realized.

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