Patent ID: 8367924
Filing Date: 2013-02-05
Classification: H01L,Y02E,Y02P

Abstract:
1. A solar cell comprising: a silicon substrate having a front surface and a back surface, wherein the back surface of the silicon substrate includes a contact structure; a doped polysilicon emitter layer formed on the front surface of the silicon substrate, the silicon substrate and the doped polysilicon emitter layer having opposite conductivity types thereby forming a semiconductor junction at the front surface; a contact structure formed on the doped polysilicon emitter layer; an insulating layer between the doped polysilicon emitter layer and the front surface of the silicon substrate; contact holes patterned in the insulating layer, wherein the contact holes concentrate current at the semiconductor junction, and allow the concentrated current flow to the contact structure on the doped polysilicon emitter layer; and a tunnel oxide between the doped polysilicon emitter layer and the silicon substrate, wherein the tunnel oxide is formed in the contact holes and is thin enough to allow current therethrough.