Lattice-matched five-junction solar cell and fabrication method thereof

The invention discloses a lattice-matched five-junction solar cell and a fabrication method thereof. A p-type Ge single chip is taken as a substrate, a GaInP nucleating layer, a GaInAs buffer layer, an AlGaAs/GaInAs DBR reflection layer, a GaInNAs sub battery, a GaInAs sub battery, an AlGaInAs sub battery and an AlGaInP sub battery are sequentially arranged on the substrate from bottom to top according to a layered lamination structure, the AlGaAs/GaInAs DBR reflection layer and the GaInNAs sub battery are connected through a first tunnel junction, the GaInNAs sub battery and the GaInAs sub battery are connected through a second tunnel junction, the GaInAs sub battery and the AlGaInAs sub battery are connected through a third tunnel junction, and the AlGaInAs sub battery and the AlGaInP sub battery are connected through fourth tunnel junction. By the lattice-matched five-junction solar cell, the collection efficiency of the GaInNAs sub battery can be improved, the comprehensive short-circuit battery of the five-junction cell is increased, moreover, the thickness of the GaInNAs sub battery can be reduced, the production cost is saved, the advantages of the five-junction cell are finally developed, and the comprehensive photoelectric conversion efficiency of the cell is improved.