Efficient and stable perovskite solar cells based on high-quality CH3NH3PbI3-xClx films modified by V2Ox additives
作者单位：Department of Physics and Materials Science Henan Normal University Henan Key Laboratory of Photovoltaic Materials Department of chemistry Nankai university
会议名称：《第五届新型太阳能电池学术研讨会》
会议日期：2018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 cells Ambient air V2Ox additives Heterogeneous structure High stability
摘 要：The method of preparing perovskite films in ambient air is of great importance to commercialize high-performance planar perovskite solar cells(PSCs). Herein, an efficient and stable inverted planar PSC has been prepared by a simple solution method in ambient air. Suitable vanadium oxide(VO) aqueous solution is mixed with CHNHPbICl precursor solution, which results in improvement in CHNHPbICl film. Perovskite films with large crystal sizes could be obtained through VO additives. The improvement in the performance of perovskite film is conducive to the separation and transmission of charge carriers. The highest power conversion efficiency(PCE) of 16.14% of PSCs has been obtained by controlling the proportion of VO additives in ambient air. It is physics mechanism that VO particles are dispersed in the perovskite crystal boundary, and the heterogeneous structure between CHNHPb ICl and VO is formed. In addition, the slow migration of iodide ions and the stable perovskite films are also achieved. What merits more attention is that the PSCs with CHNHPbICl:VO(2.5 wt%) still maintains a higher PCE after being stored for 1000 h, more than 70% of the initial one.