Ternary Organic Blend Approaches for High Photovoltaic Performance in Versatile Applications

Minwoo Nam, Joo han Kang, Jisu Shin, Jihye Na, Yunjae Park, Junhee Cho, Byunghoon Kim, Hyun Hwi Lee, Rakwoo Chang, Doo Hyun Ko

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

Ternary blend approaches are demonstrated as a universal means to improve overall performance of organic photovoltaics (OPVs) in both indoor and outdoor conditions. A comparative study on two donors:one acceptor (2D:1A) and one donor:two acceptors (1D:2A) ternary blends shows that both approaches are universally effective for indoor and outdoor operation; the 1D:2A devices incorporating a nonfullerene acceptor (NFA) benefit from less charge recombination and higher power conversion efficiencies (PCEs) for various irradiation conditions, while the performance of the 2D:1A blends depends on the emission spectrum of the incident light source. The synergistic merits of NFAs and ternary structure in the 1D:2A ternary OPVs secure better performance and generality regardless of the incident lighting. A combination of experimental and theoretical analyses unveils that NFAs optimize packing and arrangement of molecules to build efficient cascade ternary junctions in the 1D:2A blends, which can be important design guidelines for the third component in ternary OPVs. The optimized 1D:2A ternary OPV exhibits a new record PCE of 25.6% under a 200 lux light-emitting diode (LED) and 26.4% under a 1000 lux LED, and superior durability under industrial relevant thermal stress, suggesting new opportunities in diverse practical applications challenging the currently dominant PV technologies.

Original languageEnglish
Article number1901856
JournalAdvanced Energy Materials
Volume9
Issue number38
DOIs
StatePublished - 1 Oct 2019

Keywords

  • indoor power source
  • morphology
  • nonfullerene acceptors
  • organic photovoltaics
  • ternary blends

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