Simulation and performance optimization of GaAs/GaSb tandem solar cell

Multi-junction solar cells provide the highest efficiencies. Intense research activity is being held with aim to increase actual performance reached by these cells. Harvesting most of spectrum and finding optimum design variables in terms structural parameters carrier concentrations are main topics investigated developers. The GaAs/GaSb based dualjunction cell was found suitable for best absorption spectrum. In this work, an optimization approach applied fix optimal top base layer structure that maximum efficiency. To achieve this, a series numerical simulations were carried out means Silvaco ATLAS software under standard AM1.5G where thicknesses doping levels varied. obtained yields power conversion efficiency 41.65% open circuit voltage 1.78 V , short current 35.72 mA / cm 2 fill factor 90.16%. dual-junction further improved using sunlight concentration. A 45.78% at 60sun light concentration attained. It also above level ratio detriment effect shunt resistance dominates.