Back contact solar cell and method for manufacturing same

A back contact solar cell, comprising:

• a silicon substrate having a back surface comprising first regions and second regions that are alternately distributed;
• a first doped semiconductor layer formed on a first region on the back surface;
• and
• a groove structure formed on a second region, wherein the groove structure concaves inward into the silicon substrate relative to a surface of the first region, wherein an end portion of the first doped semiconductor layer adjacent to the second region is arranged in a suspended manner, wherein at least a partial surface in a side wall of the groove structure is arranged obliquely relative to a horizontal plane, to cause a cross-sectional area of at least a partial region of the groove structure to increase along a direction from a light receiving surface of the silicon substrate to the back surface, wherein the side wall of the groove structure comprises a planar surface arranged in parallel to the horizontal plane, and wherein the planar surface is between a partial surface close to a groove opening and a partial surface close to a groove bottom, and wherein the groove bottom comprises a textured surface.