The application relates to the technical field of solar cells, in particular to a front anti-reflection film of a PERC
solar cell, a preparation method and the
solar cell. The front anti-reflection film comprises a first
silicon nitride layer, a first
silicon oxynitride layer, a second
silicon nitride layer and a second
silicon oxynitride layer which are sequentially deposited on the front of the
cell. The refractive indexes of the first
silicon nitride layer, the first
silicon oxynitride layer, the second
silicon nitride layer and the second
silicon oxynitride layer are sequentially reduced, the difference between the refractive indexes of two adjacent
layers is not more than 0.22, the
refractive index is 2.30-2.35, and the thicknesses of the first silicon oxynitride layer, the second
silicon nitride layer and the second silicon oxynitride layer are all greater than the thickness of the first silicon
nitride layer. In the application, the refractive indexes of the film
layers are sequentially reduced from bottom to top, the difference between the refractive indexes of two adjacent
layers is not more than 0.22, a laminated film with a
refractive index gradient of different refractive indexes can be formed, light passes through different
refractive index gradients from air to a silicon
wafer, and therefore,
solar light can be maximally absorbed.