Simulation of Light Trapping in Ultra-thin Crystalline Silicon Absorber with Silver Nanodisc Back Reflector

In this paper we simulate a nanodisc reflector array that can enhance light trapping to overcome the limitations of low absorption in thin crystalline Si (c-Si). We performed a numerical simulation for a cell design with a thin c-Si absorber layer less than 20 μm thick. Our results show that a potential short circuit current increase of up to 22.9% is achievable, effectively doubling the optical path length compared to a planar metallic reflector.