NOVELTY - Integrated back-sheet, comprises: a homogeneous polymer substrate having opposite first and second surfaces; and many electrically conductive metal wires attached to the polymer substrate. The polymer substrate has a thickness of at least 0.25 mm, and comprises olefin-based elastomers and inorganic particulates, based on weight of the polymer substrate. The olefin-based elastomer is a copolymer comprised of at least 50 wt.% of monomer units comprising ethylene or propylene monomer units based on weight of the olefin-based elastomer. The homogeneous polymer substrate adheres to metal wires.    USE - The integrated back-sheet is useful for a solar cell module with many electrically connected back-contact solar cells (claimed).    ADVANTAGE - The integrated back-sheet is durable and can be produced in a cost effective manner.    DETAILED DESCRIPTION - Integrated back-sheet, comprises: a homogeneous polymer substrate having opposite first and second surfaces; and many electrically conductive metal wires attached to the homogeneous polymer substrate. The polymer substrate has a thickness of at least 0.25 mm, and comprises 20-95 wt.% olefin-based elastomer and 5-75 wt.% inorganic particulates, based on the weight of the polymer substrate. The olefin-based elastomer is a copolymer comprised of at least 50 wt.% of monomer units comprising ethylene or propylene monomer units based on the weight of the olefin-based elastomer. The homogeneous polymer substrate adheres to the metal wires, and the metal wires are at least partially embedded in the homogeneous polymer substrate. An INDEPENDENT CLAIM is also included for a back-contact solar module, comprising: a front light emitting substrate; a solar cell array of at least four solar cells (58) each having a front light receiving surface, an active layer that generates an electric current when the front light receiving surface is exposed to light, and a rear surface opposite the front light receiving surface, where the rear surface has positive and negative polarity electrical contacts on it, the front light receiving surface of each of the solar cells of the solar cell array is disposed on the front light emitting substrate; the homogeneous polymer substrate having opposite first and second surfaces, where the first side of the homogeneous polymer substrate is attached to the rear surface of the solar cells; and the electrically conductive metal wires attached to the homogeneous polymer substrate, where the positive and negative polarity electrical contacts on the rear surface of the solar cells of the solar cell array are physically and electrically connected to the electrically conductive metal wires attached to the homogeneous polymer substrate.    DESCRIPTION OF DRAWING(S) - The figure illustrates a schematic representation of a back-contact solar cell module in which a back-sheet has integrated conductive wires placed for connection to the back contacts of solar cells.    Transparent front sheet (54)    Encapsulant layer (56)    Photoactive solar cell (58)    Back side conductive pads (60)    Back side contact pads (61)