| 摘要 |
PURPOSE:To effectively introduce light to the lower battery of a laminated solar battery so as to remarkably improve the conversion efficiency of the solar battery by providing a transition layer between an intermediate layer having a tunnel junction for connecting the lower battery to the upper battery and the upper battery composed of A GaAs so as to obtain a carrier concentration profile in which the concentration of carriers continuously changes. CONSTITUTION:An n-type GaAs layer 2, p-type GaAs layer 3, p<+>-type Al0.4Ga0.6 As layer 4, and n<+>-type Al0.4Ga0.6As layer 5 are successively formed on a substrate 1. Then an n-type AlxGa1-xAs layer 12 in which the concentration of carriers and the AlAs crystal mixing ratio are linearly changed in the thickness direction is provided on the layer 5 as a transition layer. By providing the carrier concentration profile in which the concentration of carriers is continuously changed and the AlAs crystal mixing ration file 12 in which the AlAs crystal mixing ratio is continuously changed, reflection of light from boundaries is reduced. Then an n-type Al0.35Ga0.65As layer 6, p-type Al0.35Ga0.65As layer 7, p-type Al0.85Ga0.15As layer 8, and p-type GaAs layer 9 are successively grown on the layer 12 and electrodes 10 and 11 are respectively formed on the front and rear surfaces of this laminated solar battery. |
