Solar cell and method for manufacturing the same

A solar cell, comprising:

• a semiconductor substrate having a first major surface and a second major surface opposite the first major surface;
• a tunneling layer, wherein the tunneling layer is located on the first major surface of the semiconductor substrate;
• a first conductive region, wherein the first conductive region is located on the tunneling layer on a surface of the first tunneling layer opposite the semiconductor substrate;
• a first insulating film, wherein the first insulating film is located on a surface of the first conductive region opposite the tunneling layer and the first insulating film passivates the first conductive region;
• a second conductive region, wherein the second conductive region is located at the second major surface of the semiconductor substrate and composed of a doping region;
• a first electrode, wherein the first electrode is connected to the first conductive region and is formed through the first insulating film by firing of metal material;
• and
• a second electrode, wherein the second electrode is connected to the second conductive region,
• wherein the first conductive region comprises a first part connected to the first electrode and a second part other than the first part, and a thickness of the first part is different from that of the second part;
• wherein a thickness of the first part of the first conductive region is configured so that the tunneling layer is protected from penetration of the fired metal material;
• wherein the first insulating film is a first passivation film and a first antireflection film, and a second passivation film is located on a surface of the second conductive region opposite the semiconductor substrate, and
• wherein the first and second passivation films have fixed positive charges for the first and second conductive regions being n-type regions and fixed negative charges for the first and second conductive regions being p-type regions.