Copper oxide photocathodes: laser experiment reveals location of efficiency loss
Copper oxide (Cu2O) is a very promising candidate for future solar energy conversion: as a photocathode, the copper oxide (a semiconductor) might be able to use sunlight to electrolytically split water and thus generate hydrogen, a fuel that can chemically store the energy of sunlight. Copper oxide has a band gap of 2 electron volts, which matches up very well with the energy spectrum of s