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Volume 31 Issue 7
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Article Navigation >  International Journal of Minerals, Metallurgy and Materials  > 2024  >  31(7): 1713-1719
Shufang Li, Huilan Guan, Can Zhu, Chaoyuan Sun, Qingya Wei, Jun Yuan,  and Yingping Zou, Alkyl chain modulation of asymmetric hexacyclic fused acceptor synergistically with wide bandgap third component for high efficiency ternary organic solar cells, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1713-1719. https://doi.org/10.1007/s12613-024-2903-y
Cite this article as:
Shufang Li, Huilan Guan, Can Zhu, Chaoyuan Sun, Qingya Wei, Jun Yuan,  and Yingping Zou, Alkyl chain modulation of asymmetric hexacyclic fused acceptor synergistically with wide bandgap third component for high efficiency ternary organic solar cells, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1713-1719. https://doi.org/10.1007/s12613-024-2903-y
shu
Research Article

Alkyl chain modulation of asymmetric hexacyclic fused acceptor synergistically with wide bandgap third component for high efficiency ternary organic solar cells

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  • Corresponding author:

    Yingping Zou    E-mail: yingpingzou@csu.edu.cn

  • Received: 13 February 2024; Revised: 30 March 2024; Accepted: 7 April 2024; Available online: 8 April 2024
    Abstract
  • Herein, two asymmetric hexacyclic fused small molecule acceptors (SMAs), namely BP4F-HU and BP4F-UU, were synthesized. The elongated outside chains in the BP4F-UU molecule played a crucial role in optimizing the morphology of blend film, thereby improving charge mobility and reducing energy loss within the corresponding film. Notably, the PM6:BP4F-UU device exhibited a higher open-circuit voltage (Voc) of 0.878 V compared to the PM6:BP4F-HU device with a Voc of 0.863 V. Further, a new wide bandgap SMA named BTP-TA was designed and synthesized as the third component to the PM6:BP4F-UU host binary devices, which showed an ideal complementary absorption spectrum in PM6:BP4F-UU system. In addition, BTP-TA can achieve efficient intermolecular energy transfer to BP4F-UU by fluorescence resonance energy transfer (FRET) pathway, due to the good overlap between the photoluminescence (PL) spectrum of BTP-TA and the absorption region of BP4F-UU. Consequently, ternary devices with 15wt% BTP-TA exhibits broader photon utilization, optimal blend morphology, and reduced charge recombination compared to the corresponding binary devices. Consequently, PM6:BP4F-UU:BTP-TA ternary device achieved an optimal power conversion efficiency (PCE) of 17.83% with simultaneously increased Voc of 0.905 V, short-circuit current density (Jsc) of 26.14 mA/cm2, and fill factor (FF) of 75.38%.
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