Solar cell and method for manufacturing the same

A solar cell, comprising:

• a substrate of a first conductivity type, the substrate having a via hole;
• an emitter disposed at the substrate and the via hole, and having a second conductivity type that is opposite the first conductivity type;
• an anti-reflection layer disposed on a first surface of the substrate and inside the via hole, the anti-reflection layer including a first portion disposed on the first surface of the substrate and a second portion disposed inside the via hole;
• a first electrode disposed on the first surface of the substrate and in the via hole and the first electrode directly contacted to the emitter between the first surface and a second surface of the substrate in the via hole;
• a first electrode bus bar disposed on the second surface of the substrate and in the via hole;
• and
• a second electrode disposed on the second surface of the substrate and connected to the substrate,
• wherein the first electrode and the first electrode bus bar are disposed between the first surface and the second surface of the substrate in the via hole,
• the second portion of the anti-reflection layer is entirely disposed near a contact point between the first electrode and the first electrode bus bar and nowhere else,
• materials of the second portion of the anti-reflection layer equals materials of the first portion of the anti-reflection layer, and
• an upper side surface of the first electrode bus bar disposed besides the contact point contacts with the second portion of the anti-reflection layer and a lower side surface which is not the upper side surface of the first electrode bus bar contacts with the emitter inside the via hole.