Optical absorption enhancement in slanted silicon nanocone hole arrays for solar photovoltaics

Zhang Shu-Yuan, Liu Wen, Li Zhao-Feng, Liu Min, Liu Yu-Sheng, Wang Xiao-Dong^†,, Yang Fu-Hua

(a) Absorption spectra of vertical (ϕ = 0°) NCH array for different values of taper angle (θ). (b) Absorption spectra of the θ = 20° NCH array with different values of tilt angle (ϕ). The absorption spectra in panels (a) and (b) are shifted from each other in the vertical axis for clarity.