Method for producing a back-contact back-sheet for a photovoltaic module comprising back-contact cells, said back-contact back-sheet comprising an outer face facing the air-side of said photovoltaic module and an inner face opposite said outer face and facing the inside of said photovoltaic module, said method comprising the steps of: providing a substrate having an outer surface facing the air-side of said photovoltaic module and coincident with said outer face of said back-contact back-sheet and an inner surface opposite said outer surface and facing the inside of said photovoltaic module; applying to said substrate a layer of electrically conductive material adapted to be formed as a connecting circuit to the electrodes of said solar cells, said application of said layer of electrically conductive material to said substrate being performed in such a way that said layer of electrically conductive material fixedly adheres to said inner surface of said substrate; processing said layer of electrically conductive material so as to form said connecting circuit, said step of processing said layer of electrically conductive material comprising mechanically milling said layer of electrically conductive material, said processing being performed after said step of applying said layer of electrically conductive material to said substrate, forming a plurality of windows in said substrate of said back-contact back-sheet, said step of forming said plurality of windows being performed after said step of applying said layer of electrically conductive material onto said substrate, each of said windows being formed in a position of said substrate so as to leave exposed to the outside a predetermined portion of the surface of said layer of electrically conductive material facing said inner surface of said substrate. providing a substrate having an outer surface facing the air-side of said photovoltaic module and coincident with said outer face of said back-contact back-sheet and an inner surface opposite said outer surface and facing the inside of said photovoltaic module; applying to said substrate a layer of electrically conductive material adapted to be formed as a connecting circuit to the electrodes of said solar cells, said application of said layer of electrically conductive material to said substrate being performed in such a way that said layer of electrically conductive material fixedly adheres to said inner surface of said substrate; processing said layer of electrically conductive material so as to form said connecting circuit, said step of processing said layer of electrically conductive material comprising mechanically milling said layer of electrically conductive material, said processing being performed after said step of applying said layer of electrically conductive material to said substrate, forming a plurality of windows in said substrate of said back-contact back-sheet, said step of forming said plurality of windows being performed after said step of applying said layer of electrically conductive material onto said substrate, each of said windows being formed in a position of said substrate so as to leave exposed to the outside a predetermined portion of the surface of said layer of electrically conductive material facing said inner surface of said substrate.