Figure 4
From: Design of dual-diameter nanoholes for efficient solar-light harvesting
Absorption spectra. Absorption spectra of the optimized DNH (Ltop/L = 30%, a = 700 nm, dtop/a = 0.9, and dbot/a = 0.5), SNH with an identical Si volume, and thin film systems with an identical Si thickness. The best SNH system with a = 600 nm and d = 480 nm is also inserted for comparison. The thin lines are the calculated absorption spectra, and the thick ones are the smoothed versions.