NOVELTY - The improved electrode structure comprises a back electrode (1), a transparent conducting glass layer (2) having a light-penetrated surface (21), and a photoelectric conversion layer (3) disposed between the back electrode and the transparent conducting glass layer to absorb light passing through the light-penetrated surface and to convert light energy into electric energy. The transparent conducting glass layer embeds a grid electrode made of metal or electrically conductive polymer to decrease uneven voltage on the light-penetrated surface and to increase efficiency of the solar cells.    USE - The improved electrode structure is useful for improving efficiency of a solar cell such as a single-crystal silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell and a gallium arsenide solar cell.    ADVANTAGE - The improved electrode structure reduces uneven electric potential thus enhancing photoelectric conversion effect of the solar cell.    DETAILED DESCRIPTION - The improved electrode structure comprises a back electrode (1), a transparent conducting glass layer (2) having a light-penetrated surface (21), and a photoelectric conversion layer (3) disposed between the back electrode and the transparent conducting glass layer to absorb light passing through the light-penetrated surface and to convert light energy into electric energy. The transparent conducting glass layer embeds a grid electrode made of metal or electrically conductive polymer to decrease uneven voltage on the light-penetrated surface and to increase efficiency of the solar cells. The grid electrode made of metal or electrically conductive polymer has a straight-line shape and a V-type shape with a default angle, which is an acute angle, an obtuse angle and a right angle.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic cross-sectional view of a solar cell.    Back electrode (1)    Transparent conducting glass layer (2)    Photoelectric conversion layer (3)    Light-penetrated surface (21)    P-type layer (31)    I-type layer. (32)