Solar cell and its production process

The present invention relates to a solar cell comprising a support (6), a back electrode layer (5), at least a hydrogenated microcrystalline silicon photoelectric device (9), and a top electrode layer (11). The back electrode layer (5) has a rough surface. The solar cell comprises, between the back electrode layer (5) and the hydrogenated microcrystalline silicon photoelectric device (9), an asymmetric intermediate layer (8), said intermediate layer (8) being adjacent to said hydrogenated microcrystalline silicon photoelectric device (9) and having a surface, on the side of the back electrode layer (5), having a roughness greater than the roughness of the surface of said intermediate layer (8) on the side of the hydrogenated microcrystalline silicon device (9). Such solar cells allow to obtain optimum Voc and FF parameters, while maintaining high current.