Linkage Regulation of Back-To-Back Connected Dimers as Guest Acceptors Enables Organic Solar Cells with Excellent Efficiency, Stability and Flexibility,Advanced Functional Materials

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Linkage Regulation of Back-To-Back Connected Dimers as Guest Acceptors Enables Organic Solar Cells with Excellent Efficiency, Stability and Flexibility
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-09-18 , DOI: 10.1002/adfm.202414803
Shiyong You ₁ , Youhui Zhang ₂ , Bin Huang ₃ , Sang Young Jeong ₄ , Xiaozhong Shuai ₁ , Shuiyuan Huang ₁ , Han Young Woo ₄ , Feiyan Wu ₁ , Lie Chen ₁

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High efficiency, stability, and flexibility are key prerequisites for the commercial applications of organic solar cells (OSCs). Herein, three back-to-back connected dimers (2Qx-TT, 2Qx-C3, 2Qx-C6) are developed as the guest acceptors for OSCs with improved comprehensive performance. By regulating the linkage from rigid bithiophene to flexible alkyl chain, the back-to-back connected dimers display quite different molecular geometry and intermolecular interactions, consequently influencing their packing arrangement, film-forming process, carrier mobilities, and the device efficiency, stability, and flexibility. By introducing these dimer acceptors as the guest into active layer, these dimers form alloy phases with the host acceptor, promoting film-forming process and charge dynamics. All ternary devices exhibit improved PCEs of over 18% than the control binary device. Among them, 2Qx-C3-based ternary device obtains the best efficiency of as high as 19.03%. Moreover, thanks to the stronger entanglement favored by the dimers with flexible linkage, the PM6:BTP-eC9:2Qx-C3-based device shows outstanding stability and flexibility. The flexible device displays an improved PCE of 16.09% with a crack-onset strain of 15.0%, showing excellent mechanical robustness close to the all-polymer devices. This work demonstrates the potential of the back-to-back connected dimer acceptors as the guest for highly efficient, stable and flexible OSCs.

中文翻译：

作为客体受体的背对背连接二聚体的联动调节使有机太阳能电池具有优异的效率、稳定性和灵活性

高效率、稳定性和灵活性是有机太阳能电池（OSC）商业应用的关键先决条件。在此，开发了三个背对背连接的二聚体（2Qx-TT、2Qx-C3、2Qx-C6）作为OSC的客体受体，提高了综合性能。通过调节刚性联噻吩到柔性烷基链的连接，背靠背连接的二聚体表现出截然不同的分子几何形状和分子间相互作用，从而影响其堆积排列、成膜过程、载流子迁移率以及器件效率、稳定性、和灵活性。通过将这些二聚体受体作为客体引入活性层，这些二聚体与主体受体形成合金相，促进成膜过程和电荷动力学。所有三元器件的 PCE 均比对照二元器件提高了 18% 以上。其中，基于2Qx-C3的三元器件获得了最佳效率，高达19.03%。此外，由于具有灵活连接的二聚体有利于更强的缠结，基于PM6:BTP-eC9:2Qx-C3的器件表现出出色的稳定性和灵活性。该柔性器件的 PCE 提高了 16.09%，裂纹起始应变为 15.0%，表现出接近全聚合物器件的优异机械鲁棒性。这项工作展示了背对背连接的二聚体受体作为高效、稳定和灵活 OSC 客体的潜力。

更新日期：2024-09-22

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