A tandem photovoltaic device comprising: a first submodule; a second submodule; an interlayer disposed between the first submodule and the second submodule, wherein the interlayer permits a portion of light to pass therethrough, the interlayer including: a first conformal layer directly contacting and conforming to a portion of a surface of the first submodule, the first conformal layer including a first polymer having a melting point less than 170 degrees C; a second conformal layer directly contacting and conforming to a portion of a surface of the second submodule, the second conformal layer including a second polymer having a melting point less than 170 degrees C; a core layer disposed between and directly contacting the first conformal layer and the second conformal layer, the core layer including a third polymer having a melting point greater than 200 degrees C; characterized in that the first polymer includes a member selected from a group consisting of: polyethylene; ethylene-vinyl acetate; polyolefin elastomer; and combinations thereof; the second polymer includes a member selected from a group consisting of: polyethylene; ethylene-vinyl acetate; polyolefin elastomer; and combinations thereof; and the third polymer includes a member selected from a group consisting of: oriented polyethylene terephthalate; polytetrafluoroethylene; polycyclooctene; biaxially-oriented polyethylene terephthalate; polyimide; and combinations thereof. a first submodule; a second submodule; an interlayer disposed between the first submodule and the second submodule, wherein the interlayer permits a portion of light to pass therethrough, the interlayer including: a first conformal layer directly contacting and conforming to a portion of a surface of the first submodule, the first conformal layer including a first polymer having a melting point less than 170 degrees C; a second conformal layer directly contacting and conforming to a portion of a surface of the second submodule, the second conformal layer including a second polymer having a melting point less than 170 degrees C; a core layer disposed between and directly contacting the first conformal layer and the second conformal layer, the core layer including a third polymer having a melting point greater than 200 degrees C; characterized in that the first polymer includes a member selected from a group consisting of: polyethylene; ethylene-vinyl acetate; polyolefin elastomer; and combinations thereof; the second polymer includes a member selected from a group consisting of: polyethylene; ethylene-vinyl acetate; polyolefin elastomer; and combinations thereof; and the third polymer includes a member selected from a group consisting of: oriented polyethylene terephthalate; polytetrafluoroethylene; polycyclooctene; biaxially-oriented polyethylene terephthalate; polyimide; and combinations thereof. a first conformal layer directly contacting and conforming to a portion of a surface of the first submodule, the first conformal layer including a first polymer having a melting point less than 170 degrees C; a second conformal layer directly contacting and conforming to a portion of a surface of the second submodule, the second conformal layer including a second polymer having a melting point less than 170 degrees C; a core layer disposed between and directly contacting the first conformal layer and the second conformal layer, the core layer including a third polymer having a melting point greater than 200 degrees C; characterized in that the first polymer includes a member selected from a group consisting of: polyethylene; ethylene-vinyl acetate; polyolefin elastomer; and combinations thereof; the second polymer includes a member selected from a group consisting of: polyethylene; ethylene-vinyl acetate; polyolefin elastomer; and combinations thereof; and the third polymer includes a member selected from a group consisting of: oriented polyethylene terephthalate; polytetrafluoroethylene; polycyclooctene; biaxially-oriented polyethylene terephthalate; polyimide; and combinations thereof.