Back contact solar cell, preparation method therefor, and photovoltaic module

A back contact solar cell, comprising:

• a silicon substrate, having a first surface, wherein the first surface comprises a first conductive region, a second conductive region, and an insulation region located between the first conductive region and the second conductive region, wherein the first surface is provided with a groove, wherein the second conductive region corresponds to a bottom of the groove that has a textured structure, and wherein the insulation region corresponds to a side surface of the groove;
• a first transport layer located on the first conductive region;
• and
• a second transport layer located on the second conductive region, wherein the second transport layer extends from the second conductive region through the insulation region to the first conductive region, and partially covers the first transport layer, wherein a thickness of a portion of the second transport layer located on the insulation region is greater than a thickness of a portion of the second transport layer located on the second conductive region, and wherein a thickness of a portion of the second transport layer located on the first conductive region is 1.2 to 2 times a thickness of a portion of the second transport layer located on the textured structure.