Patent ID: 8835753

Claim:
A solar cell, comprising: a semiconductor base having a first surface and a second surface, wherein the semiconductor base has a first doped type; a first doped semiconductor layer disposed on the first surface of the semiconductor base, wherein the first doped semiconductor layer comprises at least one doped contact region and a doped non-contact region under the insulating layer, both of the doped non-contact region and the at least one doped contact region have a second doped type contrary to the first doped type, a dopant concentration of the doped non-contact region is greater than zero, and a dopant concentration of the at least one doped contact region is higher than the dopant concentration of the doped non-contact region; an insulating layer disposed on the first doped semiconductor layer, wherein the insulating layer has at least one opening exposing the at least one doped contact region; a second doped semiconductor layer disposed on the insulating layer and the at least one doped contact region, wherein the second doped semiconductor layer has the second doped type, and a dopant concentration of the second doped semiconductor layer is between the dopant concentration of the at least one doped contact region and the dopant concentration of the first doped semiconductor layer; and a first electrode layer disposed on the second doped semiconductor layer, wherein the first electrode layer is corresponding to the at least one doped contact region.