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. 2015 Jul 8;5:11646. doi: 10.1038/srep11646

Figure 1. Asymmetric silicon nanowire solar cell.

Figure 1

(a) Schematic illustration of the asymmetric silicon nanowire (SiNW) solar cell consisting of an array of radial p-n junction asymmetric SiNWs, back surface field (BSF) layer, Al back reflector and Ag top electrode. The asymmetric SiNW has a shorter core diameter (DB) at the bottom than at the top (DT), similar to a funnel or an inverted nanoconical SiNW, while a symmetric SiNW has DT same as DB. (b) Tilted view (45°) SEM image of the SiNW arrays. (c) Enlarged view of the asymmetric SiNW with DT of 370 nm and DB of 290 nm before p-type shell deposition. A slant bottom angle (θB, red) is lower than 90°. (d) Optical image of a vertical SiNW solar cell with an area of 1 cm2.