NRL designs multi-junction solar devices to break the 50% conversion efficiency barrier. The major technical breakthrough could come with novel semiconductor materials lattice-matched to Indium phosphide (InP)
Engineers just smashed the world record for solar power
PV SOLAR: new prototype Australian photovoltaic cells harvest an unheard-of 34.5 percent of the sun's energy without concentrators — a new world record. it works by splitting the incoming sunlight into four bands. The infrared band of that light is reflected back towards a silicon solar cell, and the other three bands are directed into a three-layer, new type of solar cell, made of: indium-gallium-phosphide; indium-gallium-arsenide; and germanium.