Light trapping and optical absorption enhancement in vertical semiconductor Si/SiO2 nanowire arrays
(color online) (a) Measured reflection spectra of an Si NW array of period P = 500 nm and NW diameter D of core = 160 nm and length L = 5000 nm for the Si NW arrays with different SiO2 shells. The two colorful inset squares are optical images of the NW array in the cases without and with 60-nm conformal SiO2 coating. (b) Calculated reflectance spectra as a function of the SiO2 coating thickness for the same geometries as that in panel (a) obtained by FDTD simulations.
