Other notable cells include:
– InGaP/GaAs/InGaAs mechanical stack that achieved a world record 33.3% efficiency under AM1.5G, following joint work by Japan Energy Co., Sumitomo Electric Co. and Toyota Tech. Inst.
– AlGaAs/GaAs monolithic tandem cell with a 1 sun AM1.5 efficiency of 27.6% by Hitachi Cable Co.
– GaAs/GaInAsP mechanical stack tandem cell with a 1 sun AM1.5 efficiency of 31.1% by Sumitomo Electric Co.
– InGaP/GaAs/Ge concentrator cell with an efficiency in excess of 36% for concentrations from 100-500 suns; the increase in efficiency under concentration.
Due to the series connection in the multi-junction solar cell, the radiation resistance of the cell as a whole will be dominated by the worst performing layer.