Figure 4.

Comparison of the effectiveness of the plasmon channel expressed by $\frac{q_m}{q_0}\left(\omega \right)$ (cf. Equation (18)) for the same substrate semiconductor Si (upper) and CIGS (lower) with Au (red), Ag (blue) and Cu (green) nanoparticles of the same radius of 50 nm (left), 25 nm (right) and the same surface density ${10}^8$/cm${}^2$, versus the sun-light spectrum on the earth surface—the figure illustrates accommodation of the spectral characteristics of the plasmon-mediated photo-effect, $\frac{q_m}{q_0}\left(\omega \right)$, to sun-light spectrum for different materials and covering parameters; arrows indicate the positions of the forbidden gap for Si and CIGS, respectively, marked on the background of the solar light spectrum; the latter accommodated to the frequencies $\omega /{\omega }_1$ on the horizontal axis, the vertical axis shows the efficiency growth on the same scale for Au, Ag and Cu not related to the vertical height of the solar spectrum.