4.8 Article

High-Performance Ternary Organic Solar Cells Enabled by Introducing a New A-DA′D-A Guest Acceptor with Higher-Lying LUMO Level

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 32, Pages 36582-36591

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c07883

Keywords

Ternary organic solar cells; Guest acceptor; Morphology; Photovoltaic performance; Stability

Funding

  1. National Natural Science Foundation of China [52125306, 21875286]
  2. National Key Research & Development Program of China [2017YFA0206600]

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The introduction of the third material BTP-CC in organic solar cells allows for optimization in light absorption spectrum, BHJ morphology, and charge recombination, resulting in higher conversion efficiency and improved device stability.
A ternary strategy is viable to minimize the trade-off between short-circuit current density (J(sc)) and open-circuit voltage (V-oc) in organic solar cells. Generally, the ternary OSCs can achieve a higher PCE than the binary counterparts by subtly utilizing the particular photoelectric properties of the third material. In this regard, we choose BTP-CC with a higher-lying LUMO level based on a fused TPBT (dithienothiophen[3.2-b]-pyrrolobenzothiadiazole) central framework and CC (2-(6-oxo-5,6-dihydro-4H-cyclopenta [b]-thiophen-4-ylidene) malononitrile) flanking groups as the third component to broaden the light-absorption spectrum, regulate the bulk heterojunction (BHJ) morphology, improve the V-oc, and reduce the charge recombination in OSCs. In addition, BTP-CC demonstrates intense intermolecular energy transfer to Y6 by fluorescence resonance energy transfer (FRET) pathway, which is due to the photoluminescence (PL) spectrum of BTP-CC covering the absorption region of Y6. The PM6:Y6:BTP-CC based ternary OSC achieves a champion PCE of 17.55%. Further investigation indicates that introduction of BTP-CC could reduce the trap states in OSCs, leading to an increased charge carrier density. Moreover, the incorporation of BTP-CC could improve the device stability. These results demonstrated that BTP-CC is important in improving the photovoltaic performance of ternary OSCs, and this work also provides a guideline for constructing ideal ternary OSCs in the future.

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