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Figure 2

From: Schottky solar cell using few-layered transition metal dichalcogenides toward large-scale fabrication of semitransparent and flexible power generator

Figure 2

Solar cell of few-layer TMD (WSe2 or WS2) with an asymmetric electrode. (a) Schematic illustration of the device structure. (b) Plot of the work function for various metals measured by photoelectron yield spectroscopy. Inset in (b) shows the typical photoemission features of Au film and the fitting curve to obtain the work function. (c) Normalized PCE as a function of ΔWF between the asymmetric electrode pairs for WSe2 (red) and WS2 (blue). (d–k) (d,h) Band diagram, (e,i) photocurrent mapping, (f,j) photocurrent line scan, (g,k) band structure of few-layered (d–g) WSe2 and (h–k) WS2 asymmetric devices. (l,m) (l) Typical I ds − V ds features and (m) I sc (red) and V oc (black) of few-layered WSe2 with asymmetric electrode pairs under different incident light (600 nm) intensities.

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