SCIENCE - Revolutionary Solar Cells Double as Lasers

Commercial silicon-based solar cells – such as those seen on the roofs of houses across the country – operate at about 20% efficiency for converting the Sun’s rays into electrical energy. It’s taken over 20 years to achieve that rate of efficiency. A relatively new type of solar cell based on a perovskite material –.. ...

http://solarthermalmagazine.com/2014/03/29/revolutionary-solar-cells-d