In this contribution, we present results of an approach for tuning the color of standard industrial c-Si solar cells that is based on coating them with metallic nano-particles. In particular, thin films (< 20 nm) of a metal (e.g., silver) were sputtered onto c-Si solar cells and thermally annealed subsequently. The sizes and the shapes of the nano-particles (characterized by SEM) were found to depend on the thickness of the deposited films and the surface roughness of the substrates/solar cells. With such an approach it is possible to tune the color of the standard c-Si cells from blue to green and brownish/red. The position of the resonance peak in the reflection spectrum was found to be almost independent from the angle of incidence. This low angular sensitivity is a clear advantage compared to alternative color tuning methods, for which additional dielectric thin films are deposited on c-Si solar cells.
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G. Peharz, B. Grosschädl, C. Prietl, W. Waldhauser, F. P. Wenzl, "Tuning the colors of c-Si solar cells by exploiting plasmonic effects," Proc. SPIE 9937, Next Generation Technologies for Solar Energy Conversion VII, 99370P (23 September 2016);