Solar cell and photovoltaic module

A photovoltaic module, comprising a first encapsulation panel, a first encapsulation adhesive film, at least one cell string, a second encapsulation adhesive film, and a second encapsulation panel that are stacked, wherein the at least one cell string is formed by electrically connecting a plurality of solar cells;

• wherein each of the plurality of solar cells includes:
• a silicon substrate;
• a tunneling oxide layer formed on the silicon substrate;
• a plurality of doped polysilicon layers including a first doped polysilicon layer over the tunneling oxide layer, a second doped polysilicon layer over the first doped polysilicon layer, and a third doped polysilicon layer;
• at least one barrier layer, wherein the at least one barrier layer is between two adjacent doped polysilicon layers of the plurality of doped polysilicon layers, and the at least one barrier layer is denser than the plurality of doped polysilicon layers;
• and
• a plurality of first electrodes, the plurality of first electrodes including electrodes that are electrically connected to different doped polysilicon layers;
• wherein the at least one barrier layer comprises a first barrier layer arranged between the first doped polycrystalline silicon layer and the second doped polycrystalline silicon layer, and a second barrier layer arranged between the second doped polycrystalline silicon layer and the third doped polycrystalline silicon layer;
• wherein the first doped polycrystalline silicon layer is arranged closer to the tunneling oxide layer than the second doped polycrystalline silicon layer, and the third doped polycrystalline silicon layer is further away from the tunneling oxide layer than both the first doped polycrystalline silicon layer and the second doped polycrystalline silicon layer;
• wherein the first doped polycrystalline silicon layer is doped with phosphorus elements, and the second doped polycrystalline silicon layer and the third doped polycrystalline silicon layer are doped with phosphorus elements, and further doped with carbon elements or nitrogen elements.