Method for preparing solar cell

A method for preparing a solar cell, comprising:

• providing an N-type silicon substrate;
• depositing a pre-formed tunnel passivation structure on a back surface of the N-type silicon substrate, and then depositing a mask layer on the pre-formed tunnel passivation structure;
• cleaning a front surface of the N-type silicon substrate;
• performing boron diffusion treatment on the cleaned front surface of the N-type silicon substrate and annealing treatment on the pre-formed tunnel passivation structure in the same environment, so that a first emitter layer is formed on the front surface of the N-type silicon substrate and the pre-formed tunnel passivation structure is crystallized to obtain a tunnel passivation structure;
• performing laser patterning treatment on the first emitter layer to form a second emitter region, and then cleaning the N-type silicon substrate surface in order to clean the mask layer on the tunnel passivation structure on the back surface;
• depositing a passivation and anti-reflection film;
• and
• forming a first electrode and a second electrode, wherein the first electrode is configured to be in electrical contact with the second emitter region, and the second electrode is configured to be in electrical contact with the tunnel passivation structure.