Patent ID: 8680392

Claim:
A solar cell comprising: a semiconductor substrate of a first conductive type having at least one via hole, and including crystal silicon; an emitter layer of a second conductive type forming a p-n junction with the semiconductor substrate, and directly positioned on a first surface of the semiconductor substrate and a second surface of the semiconductor substrate opposite the first surface; a first conductor directly positioned on the emitter layer at the first surface of the semiconductor substrate, and a portion of the first conductor being positioned inside the at least one via hole; a second conductor directly positioned on the emitter layer at the second surface of the semiconductor substrate, and a portion of the second conductor being positioned inside the at least one via hole; and a third conductor positioned on the second surface of the semiconductor substrate and connected to the semiconductor substrate, the third conductor being physically separated from the second conductor and the emitter layer at the second surface of the semiconductor substrate, wherein the first conductor directly contacts with the second conductor inside the at least one via hole of the semiconductor substrate and a material of the first conductor and a material of the second conductor are different.