What would it take to create 100% efficient solar panels?

First of all, the fundamental laws of thermodynamics demands that a solar panel cannot reach an efficiency of 100%. As Paul mentioned, a (equivalent) heat engine can never exceed the Carnot efficiency. read more

First of all, the fundamental laws of thermodynamics demands that a solar panel cannot reach an efficiency of 100%. As Paul mentioned, a (equivalent) heat engine can never exceed the Carnot efficiency. For solar cells, the maximum theoretical conversion efficiency is about 88%. read more

I'd like to know if it is theoretically possible to design a solar cell with a 100% efficiency. -- S.T., Montreal, Canada. The experts say "no." Because there are specific spectral ranges for semiconductor materials, some of the radiant solar energy just cannot be used. read more

There's a really important reason you don't hear about 100% efficiency solar cells. It's the same reason you don't hear about 100% efficient heat engines. read more