Patent ID: 9741888
Date: 2017-08-22
CPC Classifications: H01L,Y02E

Claim:
1. A monolithic multiple solar cell comprising essentially of elements of the 3rd and 5th main groups of the periodic table, wherein the multiple solar cell comprises three partial cells made of GaInP/GaInAs/Ge, wherein GaInP is implemented as the upper cell and GaInAs as the central cell and Ge as the lower cell, wherein a semiconductor mirror is arranged between the central cell and the lower cell, and the central cell has a reduced thickness, and the thickness dm is 500≦dm≦2500 nm, wherein the semiconductor mirror has multiple layers with different refraction indices and/or material compositions and/or thicknesses, wherein a thickness d of the layers of the semiconductor mirror is 10 nm≦d≦150 nm, wherein the semiconductor mirror comprises n layers with 10≦n≦50, wherein a half-width value HWB of the semiconductor mirror is 50 nm≦HWB≦300 nm, wherein the semiconductor mirror has a higher reflection degree in at least one part of the spectral absorption range of the partial cell or partial cells arranged above the semiconductor mirror and has a higher transmission degree in the spectral absorption range of the partial cell or partial cells arranged below the semiconductor mirror, and wherein the multiple solar cell is constructed on a Ge substrate.