| 主权项 |
1. A photovoltaic device, comprising:
a substrate having a first surface and an opposite, second surface, wherein the substrate has a first doped-type; a first doped region in the first surface of the substrate, wherein the first doped region has a second doped-type, and a polarity of the second doped-type is substantially reversed with a polarity of the first doped-type; a second doped region in a portion of the first doped region and exposing the other portion of the first doped region, wherein a polarity of the second doped region is substantially identical to the polarity of the first doped-type; a third doped region in the exposed portion of the first doped region, wherein a polarity of the third doped region is substantially identical to the polarity of the second doped-type and a doped concentration of the third doped region is substantially greater than a doped concentration of the first doped region; a fourth doped region in the second surface of the substrate, wherein a polarity of the fourth doped region is substantially identical to the polarity of the first doped-type, and a doped concentration of the fourth doped region is substantially greater than the doped concentration of the second doped region; a first electrode on the third doped region; and a second electrode on the fourth doped region.
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