PROBLEM TO BE SOLVED: To provide an advanced solar cell structure.SOLUTION: A multi-junction solar cell has a multi-junction solar cell structure comprising: first solar sub cells (cell A); second solar sub cells (cell B) adjacent to an upper first solar sub cell; a first composition tilted intermediate layer (116) adjacent to the second solar sub cells; and third solar sub cells (cell C) adjacent to the first composition tilted intermediate layer. The third solar sub cells is lattice mismatching to the second solar sub cells. The first composition tilted intermediate layer includes a composition tilted intermediate layer so as to achieve smooth transition of a lattice constant from the second sub cells to the third sub cells in a semiconductor structure.SELECTED DRAWING: Figure 1H
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