NOVELTY - The photovoltaic module (13) comprises solar cells having a front light receiving side and an opposite rear side, and a homogeneous single layer integrated back-sheet having first and second opposite side. The homogeneous single layer integrated back-sheet comprises 30-75 wt. of olefin-based elastomer and 25-70 wt.% of inorganic particulates. The olefin-based elastomer is a copolymer comprised of 50 wt.% of monomer units comprising ethylene and propylene monomer units copolymerized with different 2-20C alpha -olefin monomer units.    USE - Used as a photovoltaic module such as a photovoltaic device.    ADVANTAGE - The photovoltaic module can be used for long term without any significant degradation in performance, exhibits enhanced chemical stability, increased mechanical strength and improved resistance to weather and fire.    DETAILED DESCRIPTION - The photovoltaic module (13) comprises solar cells having a front light receiving side and an opposite rear side, and a homogeneous single layer integrated back-sheet having first and second opposite side. The homogeneous single layer integrated back-sheet comprises 30-75 wt. of olefin-based elastomer and 25-70 wt.% of inorganic particulates. The olefin-based elastomer is a copolymer comprised of 50 wt.% of monomer units comprising ethylene and propylene monomer units copolymerized with different 2-20C alpha -olefin monomer units. The first side of the homogeneous single layer integrated back-sheet is adhered directly to the rear side of the solar cells. The second side of the homogeneous single layer integrated back-sheet forms an exposed surface of the photovoltaic module. The homogeneous single layer integrated back-sheet has a thickness of 0.3-1.3 mm. The homogeneous single layer integrated back-sheet further comprises 5-30 wt% of thermoplastic polymer adhesives and tackifiers, and a metal circuit layer comprising metal foils, sputtered metal layers and metal oxide layers. An INDEPENDENT CLAIM is included for a process for forming a photovoltaic module.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic cross sectional view of a photovoltaic module.    Front sheet (12)    Photovoltaic module (13)    Front encapsulant layer (14)    Solar cell layer (16)    Olefin-based elastomer containing sheet. (22)