UV Encapsulated Monolithic Perovskite/Silicon Tandem Solar Cells for Hundred-Watt Power System

Efficient and lossless encapsulation must be resolved before the industrialization of monolithic perovskite/silicon tandem solar cells (PSTs). Here, an ultraviolet (UV) curable material, which is environmentally friendly and needs only 1 min of UV solidification, is designed and used to encapsulate three types of typical PSTs, namely, flat structure, special texture structure, and commercial texture structure. Since the cured encapsulating material has an appropriate refractive index similar to glass and has a nondestructive impact on the perovskite, the performance of encapsulated devices improves with the increase of current density. The device stability tests (including immersion in water and weak acid, outdoor exposure, -35 degrees C, and 60 degrees C/85RH% environment) demonstrated an initial efficiency of more than 90% after 1000 h. A 100 W PST power station is built by encapsulating PSTs with an expanded area (>10 cm2).