A method of making an electro-active system, comprising: (a) providing a first substrate (101, 201) having a first surface, wherein the first substrate is composed of a water-soluble solid polymer comprising polyvinyl alcohol, a polyacrylamide, a polyacrylic acid, a polyisocyanate, a starch, or a cellulose; (b) providing a second substrate (102, 202) having a first surface, wherein the second substrate is composed of a solid material and the first surface of the second substrate comprises one or more relief structures (104, 204); (c) providing a curable liquid material (103, 203); (d) disposing the curable liquid material between the first surface of the first substrate and the first surface of the second substrate, wherein the first surface of the first substrate and the first surface of the second substrate are adjacent to each other; (e) curing the curable liquid material to form a polymeric film between the first surface of the first substrate and the first surface of the second substrate; (f) removing the first substrate from the polymeric film_by exposing the first substrate to an aqueous medium, thereby dissolving the first substrate; removing the polymeric film from the second substrate, so to obtain a polymeric thin film, comprising: a naturally curved first surface; and a naturally curved second surface disposed opposite the naturally curved second surface, wherein the naturally curved second surface comprises the one or more relief structures (104, 204); (g) providing a curved substrate having a concave surface and a convex surface, wherein the concave surface is opposite the convex surface; (h) securing the polymeric thin film to the curved substrate such that the naturally curved second surface of the polymeric film faces the concave surface of the curved substrate and forms a sealed cavity between the polymeric film and the curved substrate; and (i) injecting an electro-active material into the sealed cavity via an injection site in the polymeric film. (a) providing a first substrate (101, 201) having a first surface, wherein the first substrate is composed of a water-soluble solid polymer comprising polyvinyl alcohol, a polyacrylamide, a polyacrylic acid, a polyisocyanate, a starch, or a cellulose; (b) providing a second substrate (102, 202) having a first surface, wherein the second substrate is composed of a solid material and the first surface of the second substrate comprises one or more relief structures (104, 204); (c) providing a curable liquid material (103, 203); (d) disposing the curable liquid material between the first surface of the first substrate and the first surface of the second substrate, wherein the first surface of the first substrate and the first surface of the second substrate are adjacent to each other; (e) curing the curable liquid material to form a polymeric film between the first surface of the first substrate and the first surface of the second substrate; (f) removing the first substrate from the polymeric film_by exposing the first substrate to an aqueous medium, thereby dissolving the first substrate; removing the polymeric film from the second substrate, so to obtain a polymeric thin film, comprising: a naturally curved first surface; and a naturally curved second surface disposed opposite the naturally curved second surface, wherein the naturally curved second surface comprises the one or more relief structures (104, 204); (g) providing a curved substrate having a concave surface and a convex surface, wherein the concave surface is opposite the convex surface; (h) securing the polymeric thin film to the curved substrate such that the naturally curved second surface of the polymeric film faces the concave surface of the curved substrate and forms a sealed cavity between the polymeric film and the curved substrate; and (i) injecting an electro-active material into the sealed cavity via an injection site in the polymeric film.