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.
Silicon is naturally shiny, meaning it reflects light rather than absorbing it. Engineering a microscopic, textured surface or adding a chemical coating ensures that as many photons as possible enter the cell. 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
The foundation of solar energy is the , first observed in 1839 by Edmond Becquerel. To understand how it works, we have to look at the subatomic level of semiconductors, usually silicon. When a photon (a particle of light) hits
In a semiconductor, electrons exist in a "valence band" where they are bound to atoms. Above this is the "conduction band." The energy difference between these two is the band gap.