Solar cell, manufacturing method therefor, and photovoltaic module

A solar cell, comprising:

• a substrate including a first surface and a second surface opposing the first surface, wherein the second surface has a first region and a second region, and a transition region between the first region and the second region, the transition region having a sidewall;
• a first tunneling layer on the first region;
• a first doped conductive layer on the first tunneling layer, the first doped conductive layer having a sidewall;
• a second tunneling layer on the second region;
• a second doped conductive layer on the second tunneling layer;
• a third doped conductive layer having a first part on the sidewall of the first doped conductive layer, a second part on the sidewall of the transition region, and a third part extending from an end of the second part in a direction away from the first region toward the second region, wherein the first doped conductive layer has doping ions of a first type, and the third doped conductive layer has doping ions of a second type different from the first type;
• and
• a passivation layer over at least surfaces of the first doped conductive layer, the second doped conductive layer, and the third doped conductive layer, wherein the passivation layer has a first portion over a surface of the first part, and a second portion over a surface of the second part, and wherein the first portion has a first thickness, and the second portion has a second thickness less than the first thickness;
• wherein the transition region includes a first transition region, a flat region, a second transition region, and a textured region, the first transition region is between the first region and the flat region, the second transition region is between the flat region and the textured region, and the third doped conductive layer is separated from the second doped conductive layer by at least the textured region and the second transition region.