NOVELTY - An optoelectronical semiconductor device comprises two optoelectronical structures (20, 21), each containing p-n junction; and a transparent bonding structure (23) for electrically connecting the optoelectronical structures. The bonding structure comprises two conductive layers (231, 232), each having a bonding surface, and a transparent adhesive layer connecting the conductive layers and filled in a space formed by connection. The bonding surfaces are uneven surface.    USE - As optoelectronical semiconductor device used in solar cell and light-emitting device for converting solar energy into electricity.    ADVANTAGE - The optoelectronical semiconductor device increases efficiency of solar cell device and light-emitting device.    DETAILED DESCRIPTION - An optoelectronical semiconductor device having a bonding structure, comprises a first optoelectronical structure (20) containing a first p-n junction; a second optoelectronical structure (21) containing a second p-junction; and a transparent bonding structure (23) for electrically connecting the first and second optoelectronical structures. The transparent bonding structure comprises a first conductive layer having a first bonding surface (231), a second conductive layer (232) having a second bonding surface, and a transparent adhesive layer connecting the first conductive layer and the second conductive layer and filled in a space formed by connection. At least one of the first bonding surface and the second bonding surface is uneven surface. The first conductive layer and/or the second conductive layer comprise a transparent metal oxide layer, a thin metal layer, or several metal bulges. The uneven surfaces comprise rough surfaces and/or surfaces with at least one pattern; or intermittent surfaces. The p-n junctions comprise p-i-n junctions. The first and second optoelectronical structures comprise a solar cell structure, or light-emitting structure. The light transmission of the transparent bonding structure of the rest solar spectrum passing the first and second optoelectronical structures is at least 60%. The transparent adhesive layers comprise distributed Bragg reflector (DBR).    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the solar cell device.    First optoelectronical structure (20)    Second optoelectronical structure (21)    Transparent bonding structure (23)    First bonding surface (231)    Second bonding surface. (232)