The role of the axial substituent in subphthalocyanine acceptors for bulk-heterojunction solar cells

C. Duan, G. Zango, M. GarcíaIglesias, F.J.M. Colberts, M.M. Wienk, M.V. Martínez-Díaz, R.A.J. Janssen, T. Torres

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Abstract

Four hexachlorosubphthalocyanines SubPcCl6-X bearing different axial substituents (X) have been synthesized for use as novel electron acceptors in solution-processed bulk-heterojunction organic solar cells. Subphthalocyanines are aromatic chromophoric molecules with cone-shaped structure, good solution processability, intense optical absorption in the visible spectral region, appropriate electron mobilities, and tunable energy levels. Solar cells with subphthalocyanines as the electron acceptor and PTB7-Th as the electron donor exhibit a power conversion efficiency up to 4% and an external quantum efficiency approaching 60% due to significant contributions from both the electron donor and the electron acceptor to the photocurrent, indicating a promising prospect of non-fullerene acceptors based on subphthalocyanines and structurally related systems.

Original languageEnglish
Pages (from-to)148-152
Number of pages5
JournalAngewandte Chemie - International Edition
Volume56
Issue number1
DOIs
Publication statusPublished - 3 Jan 2017

Keywords

  • Bulk heterojunctions
  • Electron acceptors
  • Solar cells
  • Subphthalocyanines
  • Substitution effects

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