Fig. 1. Schematic diagram of trilobal SiNWs. (a) Assembly process, geometric relationship of top view, and (b) 3D view and top view with different equivalent scales.

Fig. 2. (a) Absorption efficiency, (b) electric field distribution in yz plane, (c) light-absorption spectral power under AM 1.5 G solar spectrum, and (d) total absorption and obtainable JSC with cylindrical and trilobal SiNWs with the same cross section of 3631  nm2 and height of 0.3 μm.

Fig. 3. Absorption efficiency of cylindrical and trilobal SiNWs with different (a) cross sections and (b) heights. The change of the cross section is through changing the diameter of the cylindrical SiNW and the width of the blade of the trilobal SiNW. Total absorption and obtainable JSC of cylindrical and trilobal SiNWs with different (c) cross sections and (b) heights.

Fig. 4. Absorption efficiency of (a) cylindrical and (b) trilobal SiNWs with different incident angles, (c) diagram of two kinds of SiNWs with different incident angles, and (d) total absorption and obtainable JSC with different incident angles.

Fig. 5. Absorption efficiency (σabs/σgeom) spectra of trilobal SiNW with different polarization directions; the illustration shows the polarization directions.

Table 1. Geometric Parameters of Trilobal and Cylindrical SiNWs

Table 2. Total Light-Absorption Intensity and Obtainable $J_{\mathrm{SC}}$ of Trilobal and Cylindrical SiNWs