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Synergistic Effect of Lewis Base Polymers and Graphene in Enhancing the Efficiency of Perovskite Solar Cells
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-03-24 , DOI: 10.1021/acsaem.1c00299 Qiang Lou 1 , Gang Lou 2 , Ruixiang Peng 2 , Zhaoping Liu 2 , Wei Wang 2 , Mingxing Ji 1 , Chong Chen 1 , Xiaoli Zhang 3 , Chang Liu 2 , Ziyi Ge 2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-03-24 , DOI: 10.1021/acsaem.1c00299 Qiang Lou 1 , Gang Lou 2 , Ruixiang Peng 2 , Zhaoping Liu 2 , Wei Wang 2 , Mingxing Ji 1 , Chong Chen 1 , Xiaoli Zhang 3 , Chang Liu 2 , Ziyi Ge 2
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Incorporating Lewis base polymers into a perovskite layer has been demonstrated as one of the most effective routes to passivate trap states at the grain boundaries, whereas the inferior electrical conductivity of polymers than that of perovskite would inevitably hinder charge transport across the perovskite grains. Herein, we reported a strategy of utilizing highly conductive graphene/Lewis base polymer (PM6 or PM7) composites as additives in perovskite, which simultaneously passivates the defects and facilitates charge transport in the film. We further revealed in the work that halogen elements (Cl/F) in the polymer (PM6/PM7) can p-dope the graphene and endow it with higher hole-transport selectivity, which is of critical importance as ambipolar charge transport without selectivity would induce significant charge recombination in graphene. By this design, we achieved an outstanding efficiency of 21.21%, which is significantly higher than that of the pristine device without treatment. The device also exhibited impressive stability by retaining 90% of its initial power conversion efficiency after 480 h aging in ambient air with a ∼35% relative humidity at room temperature.
中文翻译：
Lewis基础聚合物和石墨烯在提高钙钛矿太阳能电池效率方面的协同效应
已经证明将路易斯基础聚合物掺入钙钛矿层中是钝化晶界处陷阱态的最有效途径之一，而聚合物的电导率比钙钛矿低，将不可避免地阻碍电荷在钙钛矿颗粒上的传输。本文中，我们报道了一种利用高导电性石墨烯/路易斯基础聚合物（PM6或PM7）复合材料作为钙钛矿中添加剂的策略，该策略可同时钝化缺陷并促进薄膜中的电荷传输。我们在工作中进一步揭示，聚合物（PM6 / PM7）中的卤素元素（Cl / F）可以对石墨烯进行p掺杂，并赋予其更高的空穴传输选择性，这是至关重要的，因为无选择的双极性电荷传输会在石墨烯中诱导显着的电荷重组。通过这种设计，我们实现了21.21％的出色效率，这大大高于未经处理的原始设备的效率。该器件还具有令人印象深刻的稳定性，在室温下相对湿度约为35％的环境空气中老化480小时后，仍可保持90％的初始功率转换效率。
更新日期：2021-04-26
中文翻译：
Lewis基础聚合物和石墨烯在提高钙钛矿太阳能电池效率方面的协同效应
已经证明将路易斯基础聚合物掺入钙钛矿层中是钝化晶界处陷阱态的最有效途径之一，而聚合物的电导率比钙钛矿低，将不可避免地阻碍电荷在钙钛矿颗粒上的传输。本文中，我们报道了一种利用高导电性石墨烯/路易斯基础聚合物（PM6或PM7）复合材料作为钙钛矿中添加剂的策略，该策略可同时钝化缺陷并促进薄膜中的电荷传输。我们在工作中进一步揭示，聚合物（PM6 / PM7）中的卤素元素（Cl / F）可以对石墨烯进行p掺杂，并赋予其更高的空穴传输选择性，这是至关重要的，因为无选择的双极性电荷传输会在石墨烯中诱导显着的电荷重组。通过这种设计，我们实现了21.21％的出色效率，这大大高于未经处理的原始设备的效率。该器件还具有令人印象深刻的稳定性，在室温下相对湿度约为35％的环境空气中老化480小时后，仍可保持90％的初始功率转换效率。
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