The idea of transporting power through laser light is an interesting area of research. Conversions of up to 54% have been reported for long distance transmission. I would assume reflectance/transmission (non absorption) plays a role in the loss of efficiency, but aside from hole recombination, is there any other loss-factors?
My question is what if, all of this band-gap-energy matching light was absorbed by the semiconductor, and no electron-holes recombine before the electrons are extracted. Then would the electrical output be close to 100%? Or is there a loss when traveling through the PN junction that results in heat emission? If so, then what is this called?