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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • Asymmetric Siloxane-Functional Side Chains Enable High-Performance Donor Copolymers for Photovoltaic Applications

    摘要： In this work, three benzodithiophene (BDT)-benzotriazole (BTA) alternated wide bandgap (WBG) copolymers attaching symmetric or asymmetric conjugated side chains, namely PDBTFBTA-2T, PBDTFTBA-TSi and PBDTFBTA-2Si, were developed for efficient nonfullerene polymer solar cells. The symmetry effect of the side chains was investigated in detail on the overall properties of these donor polymers. The results demonstrated that the introduced siloxane functional groups showed less effect on the absorptions and frontier orbital levels of the prepared polymers but had significant effect on the miscibility between these polymer donors and nonfullerene acceptor. If increasing the content of siloxane functional groups, the miscibility of the polymer donors and Y6 would be improved, leading to the decreased domain size and more mixed domains. Interestingly, the active blend based on PBDTFTBA-TSi with asymmetric side chains exhibited more balanced miscibility, carrier mobility and phase separation, benefiting exciton diffusion and dissociation. Therefore, a champion power conversion efficiency (PCE) of 14.18% was achieved finally in PBDTFTBA-TSi devices, which was 20.6% and 19.0% higher than the symmetric counterparts of PBTFBTA-2T devices (PCE = 11.76%) and PBDTFBTA-2Si devices (PCE = 11.92%), respectively. This work highlights that the asymmetric side chain engineering based on siloxane functional groups is a promising design strategy for high-performance polymer donor semiconductors.

    关键词： molecular design strategy,nonfullerene polymer solar cells,siloxane functional group,wide bandgap copolymers,asymmetric side chains

    更新于2025-09-19 17:13:59

  • Perylene Diimide‐Based Nonfullerene Polymer Solar Cells with over 11% Efficiency Fabricated by Smart Molecular Design and Supramolecular Morphology Optimization

    摘要： A series of perylene diimide (PDI) derivatives, TPP-PDI, TPO-PDI, and TPS-PDI, are developed for nonfullerene polymer solar cells (NF-PSCs) by flaking three PDI skeletons around 3D central cores with different configurations and electronic states, such as triphenylphosphine (TPP), triphenylphosphine monoxide (TPO), and triphenylphosphine sulfide (TPS). These small-molecule acceptors have a “three-wing propeller” structure due to their similar backbones. By changing the electron density of phosphorus atoms through oxidation and sulfuration, the “folding-back” strength is decreased, resulting in a less twisted molecular conformation. The stronger electron-withdrawing ability of the oxygen atom affords TPO-PDI the least twisted conformation, which enhances the crystallinity of this complex. NF-PSCs based on PTTEA:TPO-PDI exhibit a high power conversion efficiency (PCE) of 8.65%. Ultimately, the joint “molecular lock” effect arising from OH???F and OH???OP supramolecular interactions is achieved by introducing 4,4′-biphenol as an additive, which successfully promotes fibril-like phase separation and blend morphology optimization to generate the highest PCE of 11.01%, which is currently the highest value recorded for NF-PSCs based on PDI acceptors.

    关键词： triphenylphosphine oxide cores,nonfullerene polymer solar cells,molecular locks,hydrogen bonds,perylene diimide acceptors

    更新于2025-09-11 14:15:04