Photovoltaic device

1. A photovoltaic device of the thin film type, comprising

an active layer that is in a shape of an array of defined and repeating geometrical structures,

wherein each geometrical structure comprises a base and a single point apex, the single point apex and the base being connected by at least three n-polygonal surfaces, wherein n represents the number of sides of each polygonal surface and is equal to 4 or higher.

2. A photovoltaic device according to claim 1 , wherein the base of each geometrical structure is an m-sided polygonal shape and each geometrical structure comprises at least m+1 surfaces.

3. A photovoltaic device according to claim 1 , wherein the array is comprised of defined and repeating geometrical structures with adjacent geometrical structures abutting each other.

4. A photovoltaic device according to claim 1 , wherein the array is comprised of geometrical optical relief structures that have a same orientation, an alternating orientation or a random orientation with respect to each other.

5. A photovoltaic device according to claim 1 , wherein the active layer comprises an amorphous material.

6. A photovoltaic device according to claim 1 , wherein the active layer comprises amorphous silicon.

7. A photovoltaic device according to claim 1 , wherein the photovoltaic device further comprises a supporting substrate for the active layer, the supporting substrate having two main surface sides, which are parallel to a general plane of the active layer, and a shape of the surface side adjacent to the active layer is in the shape or in an inverse shape of the active layer.

8. A photovoltaic device according to claim 7 , wherein the supporting substrate for the active layer is a transparent cover plate, the transparent cover plate having the two main surface sides, a light receiving side and a surface side adjacent to the active layer, and the shape of the surface side adjacent to the active layer is the inverse shape of the active layer.

9. A photovoltaic device according to claim 8 , wherein a luminescent dye is present in the transparent cover plate.

10. A photovoltaic device according to claim 8 , wherein the light receiving surface side comprises the array of defined and repeating geometrical structures.

11. A photovoltaic device according to claim 10 , wherein each geometrical structure on the light receiving surface side comprises the base and the single point apex.

12. A photovoltaic device according to claim 1 , wherein in the array, the geometrical structures are arranged such that the base of each geometrical structure is on a single common plane.

13. A method for producing a photovoltaic device of the thin-film type in which an active layer is in a shape of an array of defined and repeating geometrical structures, the method comprising:

providing a supporting substrate with two main surface sides,

shaping a surface side of the two main surface sides of the supporting substrate into a shape or into an inverse shape of the defined and repeating geometrical structures of the active layer, and

applying the active layer onto the surface side of supporting substrate, wherein each geometrical structure comprises a base and a single point apex, the single point apex and the base being connected by at least three n-polygonal surfaces, wherein n represents the number of sides of each polygonal surface and is equal to 4 or higher, wherein the two main surface sides of the supporting substrate are parallel to a general plane of the active layer.

14. A method for producing a photovoltaic device according to claim 13 , wherein the active layer is applied by physical or chemical vapor deposition.

15. A method for producing a photovoltaic device according to claim 13 , wherein the photovoltaic device comprises a transparent cover plate and the transparent cover plate is the supporting substrate for the active layer.