Design of Dual-Junction Three-Terminal CdTe/InGaAs 
Solar Cells
In this paper we report the modeling-based design of a CdTe (1.5 eV) on InGaAs (0.74 eV) dual-junction three-terminal solar cell. The device was optimized for thickness of active layers and for doping levels. Efficiency of 26.6% was predicted for the tandem photovoltaic (PV) device under standard testing conditions (STC). We investigated tandem PV device performance at different temperatures and found the device had a total efficiency temperature coefficient of approximately −0.15%/°C. We also investigated device suitability for concentrated photovoltaic (CPV) applications in addition to its conventional PV applications. The device proved a good candidate for CPV applications under 1000 suns.