Patent ID: 8399760

Claim:
A solar cell, comprising: a semiconductor substrate including a via hole, the semiconductor substrate having a first surface and a second surface opposite to each other; an emitter portion formed adjacent to the first surface of the semiconductor substrate and extending to the second surface of the semiconductor substrate at a portion adjacent to the via hole; a base forming a p-n junction in the semiconductor substrate along with the emitter portion; a first electrode electrically connected to the emitter portion; and a second electrode electrically connected to the base, wherein the first electrode comprises at least a first electrode portion formed on the first surface of the semiconductor substrate, and the first electrode portion comprises: a first portion having a first width; and a second portion having a second width that is larger than the first width, wherein the first portion is formed at opposite sides of the second portion, extends in a plane that is substantially parallel to the surfaces from the opposite sides of the second portion, and terminates at opposite edges of the first surface, and wherein the second portion is formed to correspond to the via hole.