NOVELTY - The module (400) has a holographic grating element provided adjacent to and coplanar with a photovoltaic (PV) cell (420). An optically transparent cover (440) is placed in optical contact with an encapsulant layer. The transparent cover is extended over the holographic grating element. A backsheet is adhered to the PV cell along a surface (308b) opposite to a photo-voltaically operable surface. First encapsulant material covers the photo-voltaically operable surface. The holographic grating element includes a holographic grating embedded in second moisture-impermeable encapsulant material.    USE - Multi-portion monofacial and bifacial PV-cell based solar module i.e. encapsulated holographic planar concentrator.    ADVANTAGE - The module ensures increase of solar-energy collection efficiency, while simultaneously easing fabrication of the module in a cost-effective manner. The module reduces effect of humidity in ambient atmosphere when a hologram-and encapsulant-containing layer is laminated to the PV cell and sandwiching covering layers in a short cycle of fabrication. The module allows a front surface of a wedge to be appropriately oriented with respect to incident light so as to ensure that light transmitted through the surface impinges onto another surface normally. The module allows grating structures to be embedded in a standard ethyl vinyl acetate layer laminated to two optically transparent ionomer sheets i.e. Surlyn (RTM: tough easily formed thermoplastic sheet/film product), thus ensuring non-permeability of lamination/encapsulating encasing of gratings to moisture of an environment and making a laminated structure stable to a long-term UV-exposure.    DETAILED DESCRIPTION - The PV cell is a bifacial PV cell and a monofacial PV cell. The backsheet is a flexible moisture-impermeable Polyethylene terephthalate backsheet. An INDEPENDENT CLAIM is also included for a diffraction element.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a Multi-portion monofacial and bifacial PV-cell based solar module with a bifacial PV-cell.    Surface (308b)    Multi-portion monofacial and bifacial PV-cell based solar module (400)    PV cells (420, 422)    Optically transparent cover (440)    Light (444)