ABSTRACT
We analytically explore the high optical performance of an ultrathin amorphous silicon (a-Si) solar cell by rigorous coupled wave analysis (RCWA) method. By studying the absorption spectrum and field intensity profiles, we have investigatedthe importance of the grating structure via scattering and diffraction mechanism. Asignificant improvement is observed with the cell efficiency(η) as high as ~19% and the current density (Jsc) about ~29.47mA/cm2 within 50nm thick a-Si absorber region for theperpendicular polarization case(TE). In addition, this optimal designis compared with the various solar cells based on thedifferentback reflector. The demonstrated design includesindium tin oxide (ITO) as a perfectanti-reflection coating (ARC) andgoodtransparent conducting oxide layer as well. Overall, an ultrathin a-Si solar cell based on dual grating structure could show enhanced optimal performance.
