Fig. 2. (Color online) (a) UPS spectra of HAT-CN layer (0.2, 0.6, 1.0, 1.5, 2.0, 3.0 nm) on ITO substrate. (b) variation of work function (Φ) as function of the HAT-CN thickness. (c) valence region on a logarithmic scale. Broad gap states (red shaded region) are identified below the HOMO level of the 3 nm HAT-CN layer.
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