Patent ID: 9577126
Date: 2017-02-21
CPC Classifications: H01L,Y02E,Y02P

Claim:
1. A back contact solar cell, comprising: a crystalline silicon substrate having a light-receiving surface and a back surface; a first polycrystalline silicon emitter region disposed above the crystalline silicon substrate, the first polycrystalline silicon emitter region doped with dopant impurity species of a first conductivity type and further comprising ancillary impurity species different from the dopant impurity species of the first conductivity type, wherein the ancillary impurity species are disposed to a depth shallower than the dopant impurity species of the first conductivity type, and wherein the ancillary impurity species overlap with and are misaligned with the dopant impurity species of the first conductivity type; a second polycrystalline silicon emitter region disposed above the crystalline silicon substrate and adjacent to but separated from the first polycrystalline silicon emitter region, the second polycrystalline silicon emitter region doped with dopant impurity species of a second, opposite, conductivity type; and first and second conductive contact structures electrically connected to the first and second polycrystalline silicon emitter regions, respectively.