Abstract
We demonstrate a new one-step solution approach to prepare perovskite CH3NH3 PbI 3films by adding polyvinylpyrrolidone( PVP) to the standard CH3NH3 PbI 3precursor solution. The film morphologies,crystallinities,and optical properties of CH3NH3 PbI 3perovskite layers are carefully studied by SEM,XRD,and UV-Vis. The results reveal that the perovskite film properties can be manipulated by incorporating a small amount of PVP. The absorbance of the film with PVP additive is significantly higher than the pristine film and the absorption peak is red shift by 20 nm,indicating the perovskite film with additive possessing better crystal structures. The use of PVP strongly affects the crystallization process of forming pure CH3NH3 PbI 3and helps the formation of smooth film,leading not only to enhanced crystallization of CH3NH3 PbI 3but also to significantly improved coverage of CH3NH3 PbI 3on a planar substrate. The optimized power conversion efficiency( PCE) of CH3NH3 PbI 3solar cells improved from 1. 30% to8. 38% for the planar cell structure after the addition of 1% mass fraction of PVP. These results suggest that this new one-step solution approach is promising for controlling CH3NH3 PbI 3growth to achieve high-performance perovskite solar cells.
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