Improvement in the performance of inverted planar perovskite solar cells via the CH3NH3PbI3-xClx:ZnO bulk heterojunction
作者单位：Henan Key Laboratory of Photovoltaic MaterialsDepartment of Physics and Materials ScienceHenan Normal University Department of ChemistryNankai University College of Civil Engineering and ArchitectureJiaxing University SPECIFICCollege of EngineeringSwansea University Bay Campus
会议名称：《第六届新型太阳能电池材料科学与技术学术研讨会》
会议日期：2019年
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
关 键 词：Perovskite solar cell Zinc oxide Bulk heterojunction Absorption Electron mobility
摘 要：Zinc oxide(ZnO) as an electron transport material has been used in regular planar perovskite solar cells(PSCs). Herein, ZnO nanoparticles serve as an additive directly in perovskite active layer in order to fabricate a bulk heterojunction inverted planar PSC. The CHNHPbICl:ZnO bulk heterojunction is prepared by mixing ZnO nanoparticles into CHNHPbICl precursor solution. ZnO nanoparticles act as catalytic centers and induce the growth of perovskite grains leading to the formation of large-size perovskite crystals. Remarkably, hysterysis free power conversion efficiency of 17.26% is achieved when precisely control the concentration of ZnO nanoparticles in CHNHPbICl:ZnO bulk heterojunction active layer. The presence of ZnO nanoparticles in the perovskite films enhances the conductivity and electron mobility. Efficient charge injection of CHNHPbICl:ZnO film can improve charge extraction in the PSCs. Moreover, the PSCs with CHNHPbICl:ZnO bulk heterojunction exhibit high fill factor of 77.3% and-short current density of 22.71 mA cm2, which is attributed to improved perovskite quality. The bulk heterojunction structure is fabricated by combining perovskite and metal oxides, which is of great importance to the development and commercialization of PSCs in the future.