Patent ID: 8203072

Claim:
A solar cell, comprising: a substrate of a first conductive type having at least one via hole penetrating the substrate; an emitter layer positioned on an incident surface of the substrate, the emitter layer having a second conductive type opposite the first conductive type; a passivation layer positioned on an opposite surface to the incident surface of the substrate and on at least a portion of a side wall formed by the substrate in the at least one via hole; at least one first electrode on the emitter layer positioned on the incident surface of the substrate, the first electrode being directly connected to the emitter layer positioned on the incident surface of the substrate; a conductive layer positioned on the passivation layer and having at least one second electrode contacted with the opposite surface to the incident surface of the substrate; at least one first electrode current collector on the passivation layer positioned on the opposite surface to the incident surface of the substrate and on the side wall formed by the substrate in the at least one via hole, the at least one first electrode current collector being insulated from the conductive layer and being connected to the at least one first electrode through the at least one via hole; wherein the emitter layer is further positioned on the side wall formed by the substrate in the at least one via hole and the passivation layer is further positioned on the emitter layer positioned on the side wall formed by the substrate in the at least one via hole; and an antireflection layer positioned on the side wall of the at least one via hole.