Efficient organic photovoltaic cells based on nanocrystalline mixtures of boron subphthalocyanine chloride and C 60

Richa Pandey, Aloysius A. Gunawan, K. Andre Mkhoyan, Russell J. Holmes

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

The electrical and structural behavior of uniformly mixed films of boron subphthalocyanine chloride (SubPc) and C 60 and their performance in organic photovoltaic cells is explored. Device performance shows a strong dependence on active-layer donor-acceptor composition, and peak efficiency is realized at 80 wt.% C 60. The origin of this C 60-rich optimum composition is elucidated in terms of morphological changes in the active layer upon diluting SubPc with C 60. While neat SubPc is found to be amorphous, mixed films containing 80 wt.% C 60 show clear nanocrystalline domains of SubPc. Supporting electrical characterization indicates that this change in morphology coincides with an increase in the hole mobility of the SubPc:C 60 mixture, with peak mobility observed at a composition of 80 wt.% C 60. Organic photovoltaic cells constructed using this optimum SubPc:C 60 ratio realize a power conversion efficiency of (3.7 ± 0.1)% under 100 mW cm -2 simulated AM1.5G solar illumination.

Original languageEnglish (US)
Pages (from-to)617-624
Number of pages8
JournalAdvanced Functional Materials
Volume22
Issue number3
DOIs
StatePublished - Feb 8 2012

Keywords

  • boron subphthalocyanine chloride
  • bulk heterojunctions
  • organic semiconductors
  • photovoltaic devices
  • solar cells

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