INVERTED METAMORPHIC MULTIJUNCTION SOLAR CELL

摘要

A multijunction solar cell which includes: an upper first solar subcell having a first band gap; a second solar subcell adjacent to said upper first solar subcell and having a second band gap smaller than said first band gap; a third solar subcell adjacent to said second solar subcell and having a third band gap smaller than said second band gap; a graded interlayer adjacent to said third solar subcell, said graded interlayer having a fourth band gap greater than said third band gap; and at least a fourth solar subcell adjacent to said graded interlayer, said fourth solar subcell having a fifth band gap smaller than said third band gap such that said lower fourth solar subcell is lattice mismatched with respect to said third solar subcell.

主权项

1. A multijunction solar cell comprising:
an upper first solar subcell having a first band gap in the range of 1.92 to 2.2 eV; a second solar subcell adjacent to said first solar subcell and having a second band gap in the range of 1.65 to 1.78 eV; a third solar subcell adjacent to said second solar subcell and having a third band gap in the range of 1.40 to 1.50 eV; a first graded interlayer adjacent to said third solar subcell; said first graded interlayer having a fourth band gap greater than said third band gap; and a fourth solar subcell adjacent to said first graded interlayer, said fourth subcell having a fifth band gap in the range of 1.05 to 1.15 eV such that said fourth subcell is lattice mismatched with respect to said third subcell; a second graded interlayer adjacent to said fourth solar subcell; said second graded interlayer having a sixth band gap greater than said fifth band gap; and a lower fifth solar subcell adjacent to said second graded interlayer, said lower fifth subcell having a seventh band gap in the range of 0.8 to 0.9 eV such that said fourth subcell is lattice mismatched with respect to said fourth subcell; wherein the first graded interlayer is compositionally graded to lattice match the third solar subcell on one side and the lower fourth solar subcell on the other side, and is composed of (InxGa1-x)yAl1-yAs with 0