Abstract
A two-step ultrasonic spray method has been developed to fabricate centimeter-scale uniform and smooth perovskite CH3NH3PbI3 films for efficient and large-area solar cells. Aside from the advantages in larger area and higher smoothness, the perovskite films deposited by this method showed better crystallinity, lower non-radiative recombination and more efficient interfacial charge extraction properties. Through systematical optimizations, an efficient mesoscopic solar cell was finally achieved with efficiency of 16.03%. Furthermore, large-area (1×1cm2) cell was also fabricated, giving an efficiency of 13.09%. This work demonstrates that the two-step spray method can be a promising alternative to deposit high-quality and large-area perovskite absorbers to afford high cell performance.
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