NOVELTY - The device has an encapsulation layer including a flat coat surface morphology or relief/crinkle coat surface morphology presenting a random rounded ridge and valley structure, where radii of curvature of concave and convex features of the structure are between approximately 0.3 mm and 2.5 mm. A polyurethane derivative is made by reacting oligo-glycoladipates having different compositions and molecular weight with aliphatic diisocyanates. A modifier comprises low molecular weight esters, where nano-domains and micro-domains of various dimensions and configurations are present in polymer.    USE - Device e.g. optical device, concentrated system for photovoltaic modules such as plastic lenses, Fresnel lenses, micro-replicated devices and laminates of glass and bullet-proof windows, and photovoltaic device such as mono-crystalline and multi-crystalline silicon based photovoltaic device and non-silicon based photovoltaic device e.g. copper indium gallium selenide (CIGS) solar cell, organ solar cell and dye sensitized solar cell (all claimed), for space-based applications.    ADVANTAGE - The device has high resistance to degradation by UV and ionizing radiations, reduced weight and improved mechanical strength based on the polyurethane derivatives with the hardener and the modifier having transparent polymer materials with high physical and optical properties. The device achieves high efficiency and mechanical durability while simultaneously decreasing cost of the photovoltaic module.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view illustrating make-up of a solar cell module which includes a substrate with insulating surface, adhesive layer, photovoltaic converter, transparent conductive oxide layer and a highly transparent flexible protective cover layer made from polymeric material.    Insulating surface (101)    Adhesive layer (102)    Photovoltaic converters (103)    Transparent conductive oxide layer (104)    Highly transparent flexible protective cover layer (105)