NOVELTY - Photoelectric converting device comprises: (a) a substrate layer; and (b) an active layer, disposed over the substrate layer, where the active layer has a light receiving surface with a textured structure, where the textured structure comprises multiple repeated indented units and each of the indented units comprises intersecting three planes, which form an indentation tip at an intersection point between the three planes, and the three planes are perpendicular or about perpendicular to each other.    USE - The photoelectric converting device is useful in thin film solar cells for converting light energy into electric energy.    ADVANTAGE - The photoelectric converting device has high optical coupling efficiency. The reflection loss is also reduced.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a method for fabricating photoelectric converting device comprising: (a) providing a substrate layer; (b) forming a textured structure on the substrate layer, where the textured structure comprises multiple repeated indented units, each of the indented units has three planes in intersection, which form an indent tip at an intersection point between the three planes, where the three planes are perpendicular or about perpendicular to each other; and (c) forming an active layer on the textured structure, where the active layer has a same shape of the textured structure; and    (2) a method for fabricating photoelectric converting device comprising: (a) providing a flat substrate; (b) forming an active layer on the flat substrate; and (c) forming a textured structure on the active layer, where the textured structure comprises multiple repeated indented units, each of the indented units has three planes in intersection, which form an indentation tip at an intersection point between the three planes, and where the three planes are perpendicular or about perpendicular to each other.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the photoelectric converting device.    Active layer (100)    Three planes (102,104,106)