Patent ID: 8933326
Filing Date: 2015-01-13
Classification: H01L,Y02E

Abstract:
1. A multijunction compound semiconductor solar cell, comprising: a first electrode; a first cell; a buffer layer; a second cell; and a second electrode, wherein said first electrode is disposed on a side on which solar light is to be incident, said first electrode, said first cell, said buffer layer, said second cell and said second electrode being disposed in this order, said first cell includes a first photoelectric conversion layer, said second cell includes a second photoelectric conversion layer, said first photoelectric conversion layer is higher in bandgap from said second photoelectric conversion layer, said second cell is larger in lattice constant than said first cell, said buffer layer includes a plurality of semiconductor layers, said plurality of semiconductor layers is arranged such that lattice constants thereof have larger values in order from the side of said first cell to the side of said second cell, of said plurality of semiconductor layers, a semiconductor layer closest to said second cell is larger in lattice constant than said second cell, and of said plurality of semiconductor layers, two layers having the largest difference in lattice constant among each two adjacent layers are at a position closer to said first cell than the center in the thickness direction of said buffer layer.