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Fibril Network Strategy Enables High-Performance Semitransparent Organic Solar Cells

机译：原纤维网络策略使高性能半透明有机太阳能电池

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摘要

The development of semitransparent organic solar cells (ST-OSCs) represents a significant step toward the commercialization of OSCs. However, the trade-off between power conversion efficiency (PCE) and average visible transmittance (AVT) restricts further improvements of ST-OSCs. Herein, it is demonstrated that a fibril network strategy can enable ST-OSCs with a high PCE and AVT simultaneously. Herein, a wide-bandgap polymer PBT1-C-2Cl that can self-assemble into a fibril nanostructure is used as the donor and a near-infrared small molecule Y6 is adopted as the acceptor. It is found that a tiny amount of PBT1-C-2Cl in the blend can form a high speed pathway for hole transport due to the well distributed fibril nanostructure, which increases the transmittance in the visible region. Meanwhile, the acceptor Y6 guarantees sufficient light absorption. Using this strategy, the optimized ST-OSCs yield a high PCE of 9.1% with an AVT of over 40% and significant light utilization efficiency of 3.65% at donor/acceptor ratio of 0.25:1. This work demonstrates a simple and effective approach to realizing high PCE and AVT of ST-OSCs simultaneously.
机译：半透明有机太阳能电池（ST-OSCs）的发展代表了朝向OSC商业化的重要步骤。然而，功率转换效率（PCE）和平均可见光透射率（AVT）之间的权衡限制了ST-OSC的进一步改进。在此，证明纤维网络策略可以同时使用高PCE和AVT实现ST-OSC。这里，可以将可以自组装成纤维纳米结构的宽带隙聚合物PBT1-C-2Cl作为供体，并且采用近红外小分子Y6作为受体。发现混合物中的微量PBT1-C-2Cl可以形成由于良好的分布式原纤维纳米结构而形成空穴传输的高速途径，这增加了可见区域中的透射率。同时，受体Y6保证足够的光吸收。使用该策略，优化的ST-OSCS产生9.1％的高PCE，AVT超过40％，供体/受体比为0.25：1的显着光利用效率为3.65％。这项工作展示了一种简单有效的方法来同时实现高PCE和ST-OSC的AVT。

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