Abstract: A flexible substrate material having opposed front and back sides and extending in an X-Y plane, the front side being provided with a first electrode layer and further provided with at least one thin film to form at least one thin film device stack; the thin film device stack extending from the X-Y plane in a Z direction perpendicular to the X-Y plane to a distance T; the substrate material having at least one protective structure applied to at least one of the substrate material sides, the first electrode layer and the at least one thin film; the at least one protective structure extending in the Z direction to a distance S from the X-Y plane, the distance S being greater than the distance T.

Abstract: A flexible, thin film electronic device comprising a module cut from a web provided with one or more cells along substantially the whole of its length wherein the cells comprise a first electrode layer, a second electrode layer and one or more active layers provided between the electrode layers characterised in that the module includes one or more edge portions wherein an edge of the first electrode layer and an edge of the second electrode layer are each substantially coincident with an edge of the web.