Multi-junction solar cell, photovoltaic conversion component and compound semiconductor layer-by-layer structure

The invention relates to a multi-junction solar cell, a photovoltaic conversion component and a compound semiconductor layer-by-layer structure. The invention provides a multi-junction solar cell with sub-cells, and a sub-cell substrate is matched with a lattice and provided with an expected band gap. The multi-junction solar cell disclosed by the invention is composed of a plurality of sub-cells (11), (12) (13) and (14) which are laminated, each sub-cell is composed of a first compound semiconductor layer and a second compound semiconductor layer which are laminated, at least a special sub-cell (11) is composed of a first layer (11A1, 11A2) and a second layer (11C), the first layer (11A1, 11A2) is composed of a 1-A(th) layer (11AA) and a 1-B(th) layer (11AB) which are laminated, the second layer (11C) is composed of a 2-A(th) layer (11CA) and a 2-B(th) layer (11CB) which are laminated, a combination-A of the 1-A(th) layer (11AA) and the 2-A(th) layer (11CA) is determined based on a band gap value of a specific sub-cell 11, a combination-B of the 1-B(th) layer (11AB) and the 2-B(th) layer (11CB) is determined based on the difference between the lattice constant of the substrate and the lattice constant of the combination-A, and the thicknesses of the 1-B(th) layer (11AB) and the 2-B(th) layer (11CB) are determined based on the difference between the lattice constant of the substrate and the lattice constant of the combination-B, the thickness of the 1-A(th) layer (11AA) and the 2-A(th) layer (11CA).