Figure 3

Tilted nanowire array simulation results. The nanowires have height h = 1,000 nm, diameter d = 560 nm, and vertical pitch a = 600 nm. (a) Ultimate efficiency η function of nanowire array tilt angle β. The short-circuit current density is shown on the right y-axis. (b) Absorption as a function of wavelength and nanowire tilt β. The absorption shown is the average of the two polarizations. (c) The absorption spectra of the vertical nanowire array (β = 0°) and worst tilted nanowire array (β = 18°). (d) The absorption spectra of the ideal double-pass thin film, vertical nanowire array, and best tilted nanowire array (β = 53°).