Patent ID: 8507789

Claim:
A solar cell, comprising: a substrate doped with impurities of a first conductive type and having at least one via hole penetrating the substrate; an emitter layer positioned on a first surface of the substrate, the emitter layer being doped with impurities of a second conductive type opposite the first conductive type; an anti-reflection layer positioned on the emitter layer on the first surface of the substrate; at least one first electrode positioned on the emitter layer, the at least one first electrode being directly contacted with the emitter layer; a passivation layer positioned on a second surface of the substrate opposite the first surface of the substrate, the passivation layer being directly contacted with the second surface of the substrate; a conductive layer locally positioned on the passivation layer positioned on the second surface of the substrate, the conductive layer having at least one second electrode electrically passing through the passivation layer and locally contacted with the second surface of the substrate; and at least one first electrode current collector locally positioned on the passivation layer positioned on the second surface of the substrate, the at least one first electrode current collector being separated from the conductive layer and connected to the at least one first electrode through the at least one via hole, wherein the passivation layer is further positioned on a side wall formed by the substrate in the at least one via hole, the passivation layer is positioned between the at least one first electrode current collector and the side wall formed by the substrate in the at least one via hole, the passivation layer is extended from the side wall formed by the substrate in the at least one via hole to the second surface of the substrate, wherein the emitter layer is further positioned on the side wall formed by the substrate in the at least one via hole, and wherein the anti-reflection layer is further positioned on the side wall formed by the substrate in the at least one via hole.