Crystalline silicon solar cell and preparation method therefor, and photovoltaic module

A crystalline silicon solar cell, comprising

• a crystalline silicon substrate having a P-type conductivity,
• a first tunneling passivation layer arranged on a surface of one side of the crystalline silicon substrate,
• a first doped silicon layer arranged on the first tunneling passivation layer and having the p-type conductivity,
• a gallium oxide layer arranged on the first doped silicon layer and in direct contact with the first doped silicon layer,
• a first covering layer arranged on the gallium oxide layer, and
• a first electrode arranged on the first covering layer and in contact with the first doped silicon layer;
• wherein the first doped silicon layer covers a partial region of the first tunneling passivation layer, and the gallium oxide layer is also arranged at a region of the first tunneling passivation layer where the first doped silicon layer is not arranged.