Patent ID: 8796538

Claim:
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.