Rationalizing the Influence of Tunable Energy Levels on Quantum Efficiency to Design Optimal Non-Fullerene Acceptor-Based Ternary Organic Solar Cells

Safakath Karuthedath, Sri H.K. Paleti, Anirudh Sharma, Hang Yin, Catherine S. Catherine, Si Chen, Han Xu, Nisreen Alshehri, Nicolas Ramos, Jafar I. Khan, Jaime Martin, Gang Li, Frédéric Laquai, Derya Baran*, Julien Gorenflot*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Non-fullerene acceptor (NFA)-based ternary bulk heterojunction solar cells (TSC) are the most efficient organic solar cells (OSCs) today due to their broader absorption and quantum efficiencies (QE) often surpassing those of corresponding binary blends. The impact on QE of the energetics driving charge transfer at the electron donor:electron acceptor (D/A) interfaces is studied in blends of PBDB-T-2F donor with several pairs of lower bandgap NFAs. As in binary blends, the ionization energy offset between donor and acceptor (ΔIE) controls the QE and maximizes for ΔIE > 0.5 eV. However, ΔIE is not controlled by the individual NFAs IEs but by their average, weighted for their blending ratio. Using this property, the QE of a PBDB-T-2F:IEICO binary blend that has an insufficient ΔIE for charge generation is improved by adding a deep IE third component: IT-4F. Combining two NFAs enables to optimize the D/A energy alignment and cells’ QE without molecular engineering.

Original languageEnglish (US)
Article number2203464
JournalAdvanced Energy Materials
Volume13
Issue number16
DOIs
StatePublished - Apr 26 2023

Keywords

  • ionization energy offset
  • organic photovoltaics
  • quantum efficiency
  • solar cell design rules
  • ternary solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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