Interdigitated back-contacted solar cell with p-type conductivity and manufacturing thereof and photovoltaic module

A back-contacted solar cell based on a silicon substrate of p-type conductivity has a front surface for receiving radiation and a rear surface. The rear surface is provided with a tunnel oxide layer and a doped polysilicon layer of n-type conductivity. The tunnel oxide layer and the patterned doped polysilicon layer of n-type conductivity form a patterned layer stack provided with gaps in the patterned layer stack. An Al-Si alloyed contact is arranged within each of the gaps, in electrical contact with a base layer of the substrate, and one or more Ag contacts are arranged on the patterned doped polysilicon layer and in electrical contact with the patterned doped polysilicon layer.