NOVELTY - A photovoltaic device (10) comprises multilayered photovoltaic cell assembly comprised of a polygonal barrier layer (122) with a barrier coefficient of linear expansion (CLTE) and a photovoltaic cell layer disposed inboard of barrier layer peripheral edge; and a barrier perimeter spanning about the polygonal barrier layer which forms barrier layer peripheral edge (222); body portion (200) comprised of a body material with a body CLTE, where segment (400) of barrier layer peripheral edge that abuts the portion of body portion has rounded barrier perimeter corners (420) within the segment.    USE - As photovoltaic device (claimed) integrated into circuit for building structures e.g. roofing shingles or exterior wall coverings.    ADVANTAGE - The photovoltaic device has ease of manufacture; and provides low costs and/or product performance requirements that drive unique material choices and component design.    DETAILED DESCRIPTION - A photovoltaic device (10) comprises multilayered photovoltaic cell assembly comprised of at least a polygonal barrier layer (122) with a barrier coefficient of linear expansion (CLTE) and a photovoltaic cell layer disposed inboard of a barrier layer peripheral edge (222), where the barrier layer includes a barrier lower surface portion, a barrier upper surface portion and a barrier side surface portion spanning between the upper and lower surface portions with a barrier profile between the upper and lower surface portions and a barrier perimeter spanning about the polygonal barrier layer which forms the barrier layer peripheral edge; a body portion (200) comprised of a body material with a body CLTE, where the body portion is with a body lower surface portion, body upper surface portion and a body side surface portion spanning between the upper and lower surface portions and forming a body peripheral edge, where at least a portion of the body portion abuts to a segment of barrier layer peripheral edge at an interface region, where (A) segment (400) of the barrier layer peripheral edge that abuts the portion of the body portion has rounded barrier perimeter corners (420) within the segment and/or (B) the device further includes at least one component of a connector assembly at least partially embedded in the body side surface portion and connector assembly component includes a connector assembly lower surface portion, a connector assembly upper surface portion and a connector assembly side surface portion spanning between the upper and lower surface portions which forms a connector assembly peripheral edge, where the connector assembly peripheral edge that is closest to the interface region has at least one rounded connector corner, and the connector assembly is in electrical communication with the photovoltaic cell layer, where barrier layer comprises glass.    DESCRIPTION OF DRAWING(S) - The figure shows a plain view of photovoltaic device.    Photovoltaic device (10)    Polygonal barrier layer (122)    Barrier layer peripheral edge (222)    Segment of barrier layer peripheral edge (400)    Interface region (420)    Rounded barrier perimeter corners (420)    Fastening location (450)