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Extraordinary optical absorption based on diffraction grating and rear-located bilayer silver nanoparticles

A new light-trapping-structure combined of diffraction grating and rear-located bilayer silver nanoparticles for thin-film silicon solar cells are theoretically investigated. By analyzing the absorption spectra and electric field intensity profiles, we find that the grating suppresses the reflection and results in the incident light angular redistribution, and that the rear-located bilayer nanoparticles fold light into the active layer. Furthermore, the grating and metal NPs are optimized and a short-circuit current density as high as 29.7 mA/cm2 is obtained within a 1-µm-thick cell. In addition this design is applicable to silicon solar cells of various thicknesses.