Main Question or Discussion Point
my understanding is that energy is wasted in a solar cells when light with more frequency than necessary to make an electron cross the band gap comes along and the excess energy is converted to heat. does this mean if you only shined blue light at a solar cell which had a perfect electron gap material for blue light that it would be 100% efficient. Why dont they just seperate natural light into its different colors and then direct it towards the appropriate solar cell. Wouldnt this be 100% efficient?