Investigation on Performances of Perovskite Solar Cells with Graphene-Doped Nano Aluminum Oxide as Skeleton/Electron Transporting Layer

Abstract

在本文中，我们以石墨烯掺杂的纳米氧化铝作为钙钛矿太阳电池中的骨架层/电子传输层，以石墨烯优异的导电性能改善纳米氧化铝导电子的能力，增加钙钛矿吸收太阳光激发后产生的电子在光阳极上的收集效率，提升光伏性能；研究发现，掺杂不同的石墨烯可明显改善电子收集性能，随着石墨烯含量的增加，太阳电池的短路电流有增加的趋势，证实了石墨烯掺杂对氧化铝骨架层/电子收集层的改善能力；石墨烯掺杂同时会影响太阳电池的开路电压和填充因子，在改善导电子能力增加电子收集能力的同时，电子–空穴复合也有增加的趋势，因此在氧化铝为基础的钙钛矿太阳电池中，石墨烯的掺杂量要实现精细化控制，从而提高太阳电池的光伏性能，在本文中，当石墨烯含量为0.02%时，获得了最高11.58%的光电转化效率。 In this work, we used graphene-doped nano aluminum oxide as the skeleton/electron transporting layer in perovskite solar cells (PSCs). The excellent conductivity of graphene improved the electron conducting ability of nano aluminum oxide, increased the collection efficiency of electrons generated by perovskite layer after absorbing solar light. It was found that the short-circuit current of solar cells could be improved with the increase of graphene content. These results confirmed the improvement ability of graphene doping on the photovoltaic performance in PSCs with aluminum oxide as the skeleton/electron transporting layer. However, the graphene doping in aluminum oxide could also affect the open circuit voltage (Voc) and filling factor (FF) of solar cells. The combination of electron with hole was also increased, resulting in decreased Voc and FF. So, the contents of graphene must be precisely designed. In this work, the highest photoelectric conversion efficiency of 11.58% is obtained with the 0.02%content of graphene.