Sunshine is free, so can photovoltaics be cheap?
Wednesday, March 10, 2010 - 14:42
in Physics & Chemistry
Here's how to make a solar cell from silicon : take one solid block of doped silicon, saw it into thin wafers, layer said semiconductors beneath a panel of transparent glass, connect them to a metal electrode that can channel away the electrons knocked loose by incoming photons and turn it into a photovoltaic device.