Method for manufacturing solar battery

[0023] The characteristics of the present invention can be clearly understood by referring to the detailed description of the drawings and embodiments of the present case.

[0024] The manufacturing method of the solar cell of the present invention includes at least the following steps:

[0025] Step A, provide a wafer 21, such as image 3 As shown, the wafer 21 may be an n-type monocrystalline silicon wafer;

[0026] Step C1: First and second passivation layers 22 and 23 are provided, and first and second passivation layers 22 and 23 are respectively provided on the bottom and top surfaces of wafer 21, such as Figure 4A As shown, the first and second passivation layers 22, 23 can be ultra-thin, with a thickness of about 20-50 The first passivation layer 22 can be made of amorphous silicon or silicon with dopants such as carbon, nitrogen and oxygen deposited on the bottom surface of the wafer 21, and the second passivation layer 23 can be made of silicon oxide or doped non-crystalline