Hi there, I have recently been researching in depth solar cells/panels, the parameters of their efficiency and the photoelectric effect in general, specifically how different wavelengths of light affect it. My research has yielded a few facts; that the efficiency of standard silicon solar cells peaks with light at around 700nm, as higher energy can pass through, and lower energy has, well, lower energy, also that the refractive index of a material can define the wavelength of light as it passes through, and also that around 55% of light that reaches Earth's surface is above 700nm. Based on this and my limited knowledge otherwise, my question is that, if, hypothetically, a layer of transparent material with higher refractive index than the standard covering of solar cells, say flint glass, was placed directly on top of the treated silicon layer that produces the all-important photoelectric effect, so that lower wavelengths of light would be used instead of the natural, then the amount of light that is more abundant (infrared) could potentially be lowered to closer to 700nm, thus increasing the efficiency of said cell. Sorry for the long explanation, and don't hesitate to point out any points I have incorrectly taken as fact. Thanks in advance.