Abstract
High-quality mixed-cation lead mixed-halide (FAPbI3)0.85(MAPbBr3)0.15 perovskite films have been prepared using CH3NH3Cl additives via the solvent engineering method. The UV/Vis result shows that the addition of additives leads to enhanced absorptions. XRD and SEM characterizations suggest that compact, pinhole-free and uniform films can be obtained. This is attributable to the crystallization improvement caused by the CH3NH3Cl additives. The power conversion efficiency (PCE) of the F-doped SnO2 (FTO)/compact-TiO2/perovskite/Spiro-OMeTAD/Ag device increases from 15.3% to 16.8% with the help of CH3NH3Cl additive.
Highlights
Organic-inorganic hybrid lead halide perovskites have many attractive features such as tunable band gaps, easy-to-make properties, high optical absorption coefficients and superior charge transport properties
Mixed-cation and mixed-halide perovskites have been an effective approach to optimize the properties of lead halide perovskites [5,21]
Our results indicate that the MACl additive has little impact on the optical properties of the (FAPbI ) (MAPbBr3 )0.15 perovskite film but can significantly increase the optical properties of the (FAPbI3 3)0.85
Summary
Organic-inorganic hybrid lead halide perovskites have many attractive features such as tunable band gaps, easy-to-make properties, high optical absorption coefficients and superior charge transport properties. They have become one of the most promising materials for optoelectronic applications, and the perovskite solar cells have reached a certified power conversion efficiency (PCE). It is urgent to explore a method to gain high-quality films and improve perovskite crystallization. The additive can provide homogenous nucleation sites to improve uniformity It can coordinate with metal ions to decrease the crystallization rate and enlarge crystals [38–40], and highly efficient semitransparent perovskite solar cells can be achieved [41,42]. The impact of additives on the mixed composition perovskite is still an area awaiting more explorations
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