Abstract
Silicon photonic nanostructures have received considerable attention for light trapping in recent years. In this work, we demonstrate silicon nanofunnel (SiNF) array as a broadband light absorber for silicon photovoltaic devices via simulation. Due to more excellent optical couple between SiNFs and incident sunlight as well as the gradual change of the effective refractive index, the SiNF arrays exhibit significantly better optical absorption over a broad wavelength range and higher ultimate efficiencies compared to silicon nanohole array counterparts. The proposed SiNF arrays are promising for low cost ultrathin silicon solar cells and other photoactive devices.
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