Scientists at the University of California, Berkeley and the Lawrence Berkeley National Laboratory (LBNL) have created multilayer hybrid photovoltaic cells made of different perovskite materials with a peak efficiency of 26%. It is said that the battery can be easily sprayed onto a flexible surface to make flexible, highly efficient solar panels. Such solar cells employ hybrid organic-inorganic conglomerate perovskites that trap incoming photons in a manner similar to common silicon-based solar cells, converting energy into electrical current, however, unlike current rigid silicon semiconductor materials, which require large quantities Expensive processing and handling can make solar cells, which are cheaper and easier to manufacture with perovskite photovoltaic devices. This solar cell efficiency is also very high thanks to two types of perovskite interlayer separated by a single-atom-thick hexagonal boron nitride layer, each designed as a graded bandgap layer with low resistance and high gain , Able to absorb light of different wavelengths. This combination effectively collects and converts most of the spectral photons into energy. The current standard operating efficiency of this new solar cell is 21.7%, which is 10% to 20% more efficient than standard polycrystalline silicon solar cells currently used in a large number of commercial equipment and domestic solar systems.