MULTIJUNCTION SOLAR CELL Russian patent published in 2018 - IPC H01L31/687 

FIELD: power industry.

SUBSTANCE: multijunction solar cell includes the first sub-element consisting of a compound of InGaAs. The first sub-element has the first lattice constant, and the second sub-element with the second lattice constant. The first lattice constant at least by 0.008Ǻ larger than the second lattice constant and, in addition, a metamorphic buffer is provided that is made between the first and the second sub-elements. The buffer contains a sequence of at least three layers, the lattice constant of this sequence increases toward the first sub-element. The constant lattice layers of the buffer are larger than the second lattice constant, one layer of the buffer has the third lattice constant that is greater than the first lattice constant. Between the metamorphic buffer and the first sub-element, N compensating layers are made to compensate the residual voltage of the metamorphic buffer. The lattice constant of the corresponding compensating layers is smaller than the first lattice constant by an amount ΔA_N>0.0008Ǻ, and the compensating layers have an indium content of more than 1%, and the thicknesses of the N number of the compensating layers are selected from a certain ratio.

EFFECT: increase in the efficiency of the multijunction solar cell.

17 cl, 6 dwg