By stacking a perovskite layer on top of a silicon base, engineers are pushing efficiencies toward 40%, potentially halving the cost of solar power in the coming decades.
The engineering frontier is currently focused on and Tandem Cells . While traditional silicon cells have a theoretical efficiency limit (the Shockley-Queisser limit) of about 33%, layering different materials allows the cell to capture different parts of the light spectrum. Solar Energy: The Physics and Engineering of Ph...
When a photon (a particle of light) hits the solar cell with energy equal to or greater than the band gap, it knocks an electron loose. This creates an electron-hole pair . By stacking a perovskite layer on top of