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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • Readily Accessible Benzo[d]thiazole Polymers for Nonfullerene Solar Cells with >16% Efficiency and Potential Pitfalls

    摘要： Here we report facile, high-yield synthetic access to the difluoro BTA building block, 4,7-bis(5-bromo-4-(2-hexyl-decyl)-thiophen-2-yl)-5,6-difluoro-2-(pentadecan-7-yl)-benzo[d]thiazole (BTAT-2f) for use in Donor (D)-Acceptor 1(A1)-D-Acceptor 2(A2) polymers [D = bithiophene, A1 = BTA-2f, A2 = benzothiadiazole (BT) derivative] for organic solar cells (OSCs). Fine tuning of polymer optical and electronic properties is achieved by incrementally varying the A2 fluorination level. Bulk-heterojunction (BHJ) PBTATBT-4f:Y6 solar cells deliver a noteworthy power conversion (PCE) efficiency of 16.08 % (Voc =0.81 V, Jsc =27.25 mAcm-2, FF =72.70 %) without processing additives. In contrast, PBTATBT-2f:Y6 exhibits an irregular morphology and low PCE, ascribable to co-crystal formation-induced recombination, which is unprecedented for non-fullerene (NFA) OSCs. This result should be of guiding significance for future NFA design.

    关键词： Benzo[d]thiazole Polymers,Power Conversion Efficiency,Organic Solar Cells,Co-crystal Formation,Nonfullerene Solar Cells

    更新于2025-09-23 15:21:01

  • Molecular Engineering of Acceptors to Control Aggregation for Optimized Nonfullerene Solar Cells

    摘要： Dual molecular engineering on alkyl side chains and halgen accepting ends of asymmetric fused-ring acceptors has been proposed for controlling aggregation to optimized organic solar cells (OSCs). Fluorination or chlorination on end-capped group are explored along with linear octyl (C8) or branched 2-butyl-1-octyl chain (BO) substitution on donating core. The inherent features of larger Cl atom and longer C–Cl bond markedly extend the backbone stacking area and thus enhance molecular aggregation, while bulky BO chain exerts heavier steric shielding effect on backbone stacking. Consequently, IPTBO-4Cl shows properly weakened intermolecular interaction for balanced molecular aggregation. IPTBO-4Cl when blended with PM6 polymer donor delivers a highest power conversion efficiency (PCE) of 15% and with 72.6% fill factor (FF). Expectedly, fluorinated IPT-4F bearing shorter C8 chains outputs a good PCE nearing 15% with 74.2% FF. To the best of our acknowledge, the PCE of 15% is by far the highest for asymmetric FRAs based OSCs. By contrast, IPT-4Cl and IPTBO-4F with either excessively strong or weak aggregation result in relatively low photovoltaic performance. Our results demonstrate controlling aggregation via delicate molecular engineering is an undeniably effective way to achieve efficient OSCs.

    关键词： Molecular Engineering,Acceptors,Aggregation,Nonfullerene Solar Cells

    更新于2025-09-23 15:19:57