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. 2012 Jan 19;109(5):1407-1412. doi: 10.1073/pnas.1120415109

Fig. 5.

Fig. 5.

Vertical assembly of layered NW components for efficient solar cells. (A) Experimental EQE spectrum for double-NW vertical stack (thick black line) and for single-NW (thin black line) device. Both devices are on quartz without back-reflectors. Simulated EQE spectrum for the double-NW stack (dashed red line) using NWs with a Si height of 250 nm. Inset: SEM of a device consisting of two NWs stacked on quartz substrate and electrically connected in parallel; scale bar, 500 nm. (B) Experimental current densities for a single-NW device (diamonds) and stacked double-NW device (squares) under AM 1.5 G 1-sun illumination. Red markers show data without a Ag-metal BSR and purple markers data with the Ag-metal BSR. Dashed red and purple curves denote simulated current densities for stacked NWs with increasing number of NWs in the stack (N = 1, 2, 3, 4, 5) without and with a BSR, respectively.