FOUR-JUNCTION QUATERNARY COMPOUND SOLAR CELL AND METHOD THEREOF

摘要

A four-junction quaternary compound solar cell and a method thereof are provided. Forming a first subcell(100) with a first band gap, a lattice constant matching with the substrate on an InP grown substrate, forming a second subcell (200) with a second band gap bigger than the first band gap, a lattice constant matching with the substrate on the first subcell, forming a graded buffer layer (600) with a third band gap bigger than the second band gap on the second subcell, forming a third subcell(300) with a fourth band gap bigger than the third band gap, a lattice constant smaller than the substrate on the graded buffer layer, forming a fourth subcell(400) with a fifth band gap bigger than the fourth band gap, a lattice constant matching with the third subcell on the third subcell, and then forming the required four-junction solar cell then by succeeding process including removing the grown substrate, bonding a support substrate, forming electrodes, evaporating an anti-reflect film and so on.