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Mechanistic Investigation into Dynamic Function of Third Component Incorporated in Ternary Near‐Infrared Nonfullerene Organic Solar Cells

Wang, Zhuoyan ; Ji, Jingjing ; Lin, Weihua ; Yao, Yao ; Zheng, Kaibo ; Liang, Ziqi

Advanced functional materials, 2020-08, Vol.30 (31), p.n/a [Periódico revisado por pares]

Hoboken: Wiley Subscription Services, Inc

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  • Título:
    Mechanistic Investigation into Dynamic Function of Third Component Incorporated in Ternary Near‐Infrared Nonfullerene Organic Solar Cells
  • Autor: Wang, Zhuoyan ; Ji, Jingjing ; Lin, Weihua ; Yao, Yao ; Zheng, Kaibo ; Liang, Ziqi
  • Assuntos: charge and energy transfer ; charge recombination ; Charge transfer ; Condensed Matter Physics ; Current carriers ; Den kondenserade materiens fysik ; Electron transfer ; Fysik ; Materials science ; Morphology ; Natural Sciences ; Naturvetenskap ; near-infrared ; nonfullerene acceptors ; organic solar cells ; Photovoltaic cells ; Physical Sciences ; Separation ; Solar cells
  • É parte de: Advanced functional materials, 2020-08, Vol.30 (31), p.n/a
  • Descrição: Organic solar cells (OSCs) consisting of an ultralow‐bandgap nonfullerene acceptor (NFA) with an optical absorption edge that extends to the near‐infrared (NIR) region are of vital interest to semitransparent and tandem devices. However, huge energy‐loss related to inefficient charge dissociation hinders their further development. The critical issues of charge separation as exemplified in NIR‐NFA OSCs based on the paradigm blend of PTB7–Th donor (D) and IEICO–4F acceptor (A) are revealed here. These studies corroborate efficient charge transfer between D and A, accompanied by geminate recombination of photo‐excited charge carriers. Two key factors restricting charge separation are unveiled as the connection discontinuity of individual phases in the blend and long‐lived interfacial charge‐transfer states (CTS). By incorporation of a third‐component of benchmark ITIC or PC71BM with various molar ratios, these two issues are well‐resolved accordingly, yet in distinctly influencing mechanisms. ITIC molecules modulate film morphology to create more continuous paths for charge transportation, whereas PC71BM diminishes CTS and enhances electron transfer at the D/A interfaces. Consequently, the optimal untreated ternary OSCs comprising 0.3 wt% ITIC and 0.1 wt% PC71BM in the blend deliver higher JSC values of 21.9 and 25.4 mA cm‐2, and hence increased PCE of 10.2% and 10.6%, respectively. Two critical issues of interfacial charge separation in near‐infrared nonfullerene acceptor organic solar cells based on the paradigm PTB7–Th:IEICO–4F blend are unraveled as the long‐lived charge‐transfer states and the lack of a long‐range charge transportation pathway. These issues are resolved by additional incorporation of either ITIC or PC71BM, which remarkably enhances charge separation and hence afford improved efficiencies beyond 10% any post‐treatment.
  • Editor: Hoboken: Wiley Subscription Services, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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