摘要： The inverted perovskite solar cell fabricated using a two-step method exhibited the highest FF of 0.85 and good efficiency of 18% based on CH 3 NH 3 PbI 3 . A small amount of H 2 O was added into PbI 2 /DMF to make a homogenous precursor solution. A high quality PbI 2 film with full coverage was formed on a PEDOT:PSS surface by spin coating of the homogeneous PbI 2 precursor solution. The perovskite film fabricated from the high quality PbI 2 film is highly pure, smooth and very dense even without any pinhole. The champion cell achieves a remarkable fill factor (FF) of 0.85, which is the highest value reported in perovskite solar cells. The FF value is also very reproducible with less than 10% deviation for 50 cells. The cell exhibits no current hysteresis and is stable under both dark and illumination conditions in dry and inert atmospheres. The results not only provide a strategy to fabricate high efficiency inverted perovskite solar cells but also reveal how the water additive in the PbI 2 /DMF solution may affect the properties of PbI 2 and therefore the perovskite film prepared using the two-step method and the overall photovoltaic performance of the corresponding inverted solar cell. The inverted CH 3 NH 3 PbI 3 cell fabricated using a two-step method with H 2 O as an additive in a PbI 2 solution exhibited an extremely high FF of 85%. 出版日期： 2015-08-26 資源來源： Royal Society of Chemistry 識別號： ISSN: 1754-5692 識別號： EISSN: 1754-5706 識別號： DOI: 10.1039/c5ee00645g
