A special structure of pyramid square grating (PSG) is designed to reduce the light reflection of crystalline silicon solar cells. Reflectance and optical absorptions which are calculated by Finite Difference Time Domain (FDTD) methods suggested that the PSG structures had highly efficient anti-reflection effects from 300 to 400 nm. Moreover, the photocurrent density of PSG calculated in the wavelength range of 300-1000 nm has been improved by 45.09 % compared to that of planar structure, under the air mass 1.5 (AM1.5) solar illuminations.
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