NOVELTY - A multijunction solar cell comprises: (a) an upper first solar subcell having a first band gap; (b) a second solar subcell adjacent to the first solar subcell; (c) a first graded interlayer; (d) a third solar subcell adjacent to the first graded interlayer; (e) a second graded interlayer adjacent to the third solar subcell; and (f) a lower fourth solar subcell adjacent to the second graded interlayer.    USE - The multijunction solar cell is useful as semiconductor devices.    ADVANTAGE - The multijunction solar cell is based on III-V semiconductor compounds including a metamorphic layer.    DETAILED DESCRIPTION - A multijunction solar cell comprises: (a) an upper first solar subcell having a first band gap; (b) a second solar subcell adjacent to the first solar subcell and having a second band gap smaller than the first band gap; (c) a first graded interlayer adjacent to the second solar subcell, where the first graded interlayer has a third band gap greater than the second band gap; (d) a third solar subcell adjacent to the first graded interlayer, where the third subcell has a fourth band gap smaller than the second band gap so that the third subcell is lattice mismatched with respect to the second subcell; (e) a second graded interlayer adjacent to the third solar subcell, where the second graded interlayer having a fifth band gap greater than the fourth band gap; and (f) a lower fourth solar subcell adjacent to the second graded interlayer, where the lower subcell has a sixth band gap smaller than the fourth band gap so that the fourth subcell is lattice mismatched with respect to the third subcell. An INDEPENDENT CLAIM is included for a method of manufacturing a solar cell comprising: (a) providing a first substrate; (b) forming an upper first solar subcell having a first band gap on the first substrate; (c) forming a second solar subcell adjacent to the first solar subcell and having a second band gap smaller than the first band gap; (d) forming a first graded interlayer adjacent to the second solar subcell, where the first graded interlayer having a third band gap greater than the second band gap; (e) forming a third solar subcell adjacent to the first graded interlayer, where the third subcell has a fourth band gap smaller than the second band gap so that the third subcell is lattice mismatched with respect to the second subcell; (f) forming a second graded interlayer adjacent to the third solar subcell, where the second graded interlayer having a fifth band gap greater than the fourth band gap; (g) forming a lower fourth solar subcell adjacent to the second graded interlayer, where the lower subcell having a sixth band gap smaller than the fourth band gap so that the fourth subcell is lattice mismatched with respect to the third subcell; (h) mounting a surrogate substrate on top of fourth solar subcell; and (i) removing the first substrate.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the solar cell.