Solar cell, preparation method thereof, and photovoltaic module

A solar cell, comprising:

• a substrate having a front surface and a back surface disposed opposite to each other, wherein the back surface of the substrate comprises a first doped region and a second doped region that are spaced apart, and an insulating region disposed between the first doped region and the second doped region;
• a doped polysilicon passivation contact structure disposed in the first doped region;
• a doped amorphous silicon structure disposed in the second doped region;
• and
• a passivation layer disposed in the insulating region;
• wherein the doped polysilicon passivation contact structure comprises a tunneling oxide layer and a doped polysilicon layer that are stacked on the back surface of the substrate sequentially;
• the doped amorphous silicon structure comprises a doped amorphous silicon layer, and the doped polysilicon layer and the doped amorphous silicon layer have different doping types;
• wherein the passivation layer is not overlapped with the doped polysilicon passivation contact structure or the doped amorphous silicon structure along a thickness direction of the substrate.