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首页> 外文会议>Conference on Organic, Hybrid, and Perovskite Photovoltaics >Low temperature aggregation transitions in N3 and Y6 acceptors enable double-annealing method that yields hierarchical morphology and superior efficiency in nonfullerene organic solar cells
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Low temperature aggregation transitions in N3 and Y6 acceptors enable double-annealing method that yields hierarchical morphology and superior efficiency in nonfullerene organic solar cells

机译：N3和Y6受体中的低温聚集过渡使双退火方法能够在非氟联的有机太阳能电池中产生分层形态和优异的效率

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摘要

Thermal transition of organic solar cells (OSCs) constituent materials are often insufficiently researched, resulting in trial-and-error rather than rational approaches to post-casting processing strategies to improve aggregation or domain purity to enhance the power conversion efficiency. Despite the potential utility, little is known about the thermal transitions of the modern high-performance acceptors Y6 and N3 as the traditional thermal analysis does not yield a clear signal. Here, by using an optical method, we discover that the acceptor N3 has a clear solid-state aggregation transition at 82 °C. This unusually low transition not only explains prior optimization protocols, but the transition informs and enables a double-annealing method that can fine-tune aggregation and the device morphology. Compared with 16.6% efficiency for PM6:N3:PC_(71)BM control devices that match the best literature performance, higher efficiency of 17.6% is obtained through the improved protocol. Morphology characterization with x-ray scattering methods reveals the formation of a multi-length scale morphology. Moreover, the double-annealing method is illustrated and easily transferred and validated with Y6-based devices, using the transition of Y6 at 102 °C. As a result, the PCE improved from 16.0% to 16.8%. Design of high-performance acceptors with yet lower aggregation transitions might be required for OSCs to successfully transition to low thermal budget industrial processing methods where annealing temperatures on plastic substrates have to be kept low.
机译：有机太阳能电池（OSCs）构成材料的热转变通常不充分地研究，导致试验和误差而不是合理的铸造处理策略方法，以改善聚集或领域纯度，以提高功率转换效率。尽管存在潜在的效用，但对于现代高性能受体Y6和N3的热转换，因为传统的热分析不产生清晰的信号。这里，通过使用光学方法，我们发现受体N3在82℃下具有明显的固态聚集过渡。这种异常低的转换不仅解释了先前的优化协议，而且转换通知并启用可以进行微调聚集和设备形态的双退火方法。与PM6的效率为16.6％：N3：PC_（71）BM控制装置与最佳文学性能相匹配，通过改进的协议获得了17.6％的效率更高。 X射线散射方法的形态表征揭示了多长度形态的形成。此外，使用Y6在102℃的转变，用基于Y6的器件进行双退火方法和易于用Y6的装置传递和验证。结果，PCE从16.0％提高到16.8％。 OSC可能需要较低的聚合转换的高性能受体设计，以成功过渡到低热预算工业处理方法，其中塑料基材上的退火温度不得不保持低。

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