Solar cell and photovoltaic module

A photovoltaic module, comprising:

• a plurality of cell strings, each formed by connecting a plurality of solar cells;
• encapsulation layers, configured to cover surfaces of the plurality of cell strings;
• cover plates, configured to cover surfaces of the encapsulation layers away from the plurality of cell strings;
• wherein each of the plurality of solar cells comprises:
• a substrate, having a first surface, wherein the first surface has a metal pattern region, a non-metal pattern region, and a transitional region located between the metal pattern region and the non-metal pattern region;
• and wherein the metal pattern region, the non-metal pattern region and the transitional region form a step structure;
• a first passivation contact structure, located in the metal pattern region of the first surface, wherein the first passivation contact structure includes a first tunneling layer and a first doped conductive layer stacked in a direction away from the substrate;
• and
• a second passivation contact structure, including a second tunneling layer and a second doped conductive layer stacked in the direction away from the substrate;
• wherein the second passivation contact structure has a first portion over the non-metal pattern region of the first surface, a second portion over sidewalls and a top of the first passivation contact structure, and a third portion over the transitional region, and wherein the third portion is inclined relative to the first surface.