Patent ID: 8188364

Claim:
A photovoltaic cell comprising: a heterojunction between a crystalline semiconductor substrate of a first conductivity type; and a first amorphous layer, on a first face of the substrate and in a same semiconductor material as the substrate, said first amorphous layer having a second conductivity type opposite the first conductivity type and a dopant concentration of between 1×10 19 and 1×10 22 atoms/cm 3 , wherein a second face of the substrate opposite the first face is coated with a third amorphous layer in the same semiconductor material as the substrate and of a same conductivity type as the substrate, with a dopant concentration of between 1×10 19 and 1×10 22 atoms/cm 3 ; and a second amorphous layer of a same conductivity as the first amorphous layer and having a dopant concentration of between 1×10 16 and 1×10 18 atoms/cm 3 , said second amorphous layer being deposited directly on the first face of the substrate and being coated with said first amorphous layer.