Figure 6

(a) IQE of a Au-TiO₂ Schottky diode as a function of Au film thickness, t _Au, and the photon wavelength, λ. The whole λ-t _Au area is divided by three curves into different regions where the hot electrons can transport N ( = 0, 1, 2, 3) round trips within the Au film. The N = 3 region is very small on the left side of the red curve. (b) The photocurrent density generated in the top Au film, J _top (solid curves), and in the bottom Au film, J _bot (dotted curves), for both p-polarization (red), s-polarization (black) as a function of the top Au film thickness, t _top. (c) The net photocurrent density, J _sc, for both p-polarization (red), s-polarization (black) and hybrid polarization (purple) as a function of t _top. The other geometrical parameters are s = 10 nm, h = 1 μm, r = 1 μm, and p = 400 nm.