Nonfullerene/Fullerene Acceptor Blend with a Tunable Energy State for High-Performance Ternary Organic Solar Cells

Min Kim, Jaewon Lee, Dong Hun Sin, Hansol Lee, Han Young Woo, Kilwon Cho

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Ternary blending is an effective strategy for broadening the absorption range of the active layer in bulk heterojunction polymer solar cells and for constructing an efficient cascade energy landscape at the donor/acceptor interface to achieve high efficiencies. In this study, we report efficient ternary blend solar cells containing an acceptor alloy consisting of the indacenodithiophene-based nonfullerene material, IDT2BR, and the fullerene material, phenyl-C71-butyric acid methyl ester (PC71BM). The IDT2BR materials mix fully with PC71BM materials, and the energy state of this phase can be tuned by varying the blending ratio. We performed photoluminescence and external quantum efficiency studies and found that the ternary charge cascade structure efficiently transfers the photogenerated charges from the polymer to IDT2BR and finally to PC71BM materials. Ternary blend devices containing the IDT2BR:PC71BM acceptor blend and various types of donor polymers were found to exhibit power conversion efficiencies (PCEs) improved by more than 10% over the PCEs of the binary blend devices.

Original languageEnglish
Pages (from-to)25570-25579
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number30
DOIs
Publication statusPublished - 2018 Aug 1

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Keywords

  • acceptor blends
  • fullerene
  • indacenodithiophene
  • nonfullerene
  • ternary organic solar cells

ASJC Scopus subject areas

  • Materials Science(all)

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