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The design of UV/IR cut-off filter for silicon solar cell

In order to increase the reflection of incidence light which its wavelength is less than 350nm and higher than 1120nm (λ<350nm and λ>1120nm) on the surface of silicon solar cell and show no influence on the transmission of the light in spectral response range (350nm<λ<1120nm) of silicon, the IR/UV cut-off filter on encapsulation glass of silicon solar cell was designed. It can make silicon solar cell absorb the incidence light with selectivity. According to the theory of optical film, a computer program was designed. The IR cut-off filter of A[1.05(LMHML)]6[1.15(LMHML)]1.15LG on the top surface of encapsulation glass for solar cell was obtained. The transmission curve was plotted for IR cut-off filter. The curve shows: the IR cut-off filter has good selective transmission, most of the light (λ>1120nm) is reflected and all of the light (350nm<λ<1120nm) is almost transmitted to the solar cell. In the range between 350nm and 1120nm, the weighted transmission coefficient of light is 98.17%. Similarly, the UV cut-off filter of G H/2 L H/27 S on the rear of encapsulation glass for solar cell was obtained. The transmission curve was also plotted. The curve shows: the UV cut-off filter has good selective transmission, the most of light (λ<350nm) is reflected and all of the light (350nm<λ<1120nm) is almost transmitted to the solar cell. The weighted transmission coefficient of light (350nm<λ<1120nm) is 98.65%. The whole coating that combined IR and UV cut-off filter has the best selective transmission, the most of light (both λ<350nm and λ>1120nm) is reflected and all of the light (350nm<λ<1120nm) is almost transmitted to the solar cell. By calculation, we gained the weighted transmission coefficient, TW=97.49% (350nm<λ<1120nm).