Morphology Control Realizes Fast Charge Dissociation and Transport in High-Performance All-Polymer Solar Cells,ACS Applied Energy Materials

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Morphology Control Realizes Fast Charge Dissociation and Transport in High-Performance All-Polymer Solar Cells
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2024-04-16 , DOI: 10.1021/acsaem.4c00534
Yushou Zhao ₁ , Junying Wu ₂ , Wenming Li ₃ , Xiaofeng Qin ₃ , Menglan Lv ₃ , Yong Hua ₄ , Weiguo Zhu ₁ , Zhicai He ₂ , Bin Zhang _{1,

3}

Affiliation

The difficulty in controlling the morphology of the active layer is a major factor for hindering the improvement of photovoltaic performance in all-polymer solar cells (all-PSCs). Here, we introduced two kinds of high-boiling-point solvent additives, 1,8-diiodooctane (DIO) and 1-chloronaphthalene (CN), to control the donor/acceptor blends, thereby improving the film formation and crystallization kinetics and molecular orientation of the active layer in all-PSCs. In this study, the effectiveness of high-boiling-point solvent additives in controlling the morphology of the active layer is examined. Moreover, it was found that the selectivity of additives affected the photovoltaic performance in all-PSCs, and improper additives could significantly reduce the power conversion efficiencies (PCEs). Through using an all-polymer system with D18-Cl as the polymer donor and PY-IT as the polymer acceptor, the CN-treated device exhibited poor PCE, while those employing DIO significantly improved the phase separation morphology of the active layer, resulting in an impressive PCE of 16.0%. Importantly, the DIO-treated device in the D18-Cl:PY-IT system could realize the faster charge dissociation and transport as well as lower bimolecular recombination. Furthermore, the corresponding devices exhibited excellent storage stability, retaining over 80% of their initial efficiency after 3000 h in a nitrogen-atmosphere glovebox, which was potentially beneficial for the future commercial application.

中文翻译：

形态控制实现高性能全聚合物太阳能电池的快速电荷解离和传输

活性层形貌难以控制是阻碍全聚合物太阳能电池（all-PSC）光伏性能提升的主要因素。在这里，我们引入了两种高沸点溶剂添加剂，1,8-二碘辛烷（DIO）和1-氯萘（CN），来控制给体/受体混合物，从而改善成膜和结晶动力学以及分子取向全 PSC 中的活性层。在这项研究中，研究了高沸点溶剂添加剂在控制活性层形态方面的有效性。此外，研究发现添加剂的选择性会影响全PSC的光伏性能，并且不当的添加剂会显着降低功率转换效率（PCE）。通过使用以D18-Cl为聚合物供体、PY-IT为聚合物受体的全聚合物体系，CN处理的器件表现出较差的PCE，而采用DIO的器件显着改善了活性层的相分离形貌，导致PCE 高达 16.0%，令人印象深刻。重要的是，D18-Cl:PY-IT系统中经过DIO处理的器件可以实现更快的电荷解离和传输以及更低的双分子复合。此外，相应的器件表现出优异的存储稳定性，在氮气气氛手套箱中3000小时后仍保持80%以上的初始效率，这对未来的商业应用具有潜在的好处。

更新日期：2024-04-16

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