Author/Authors :
Karam، نويسنده , , Nasser H and King، نويسنده , , Richard R and Haddad، نويسنده , , Moran and Ermer، نويسنده , , James H and Yoon، نويسنده , , Hojun and Cotal، نويسنده , , Hector L and Sudharsanan، نويسنده , , Rengarajan and Eldredge، نويسنده , , Jack W and Edmondson، نويسنده , , Kenneth and Joslin، نويسنده , , David E and Krut، نويسنده , , Dimitri D and Takahashi، نويسنده , , Mark and Nishikawa، نويسنده , , Warren and Gillanders، نويسنده , , Mark and Granata، نويسنده , , Jennifer and Hebert، نويسنده , , Peter and Cavicchi، نويسنده , , B.Terence and Lillington، نويسنده , , David R، نويسنده ,
Abstract :
Dual-junction Ga0.5In0.5P/GaAs solar cells on Ge substrates have rapidly gone from small, high-efficiency laboratory cells, to large-area, high-efficiency cells manufactured at Spectrolab in high volume. Over 500,000 of these dual-junction (DJ) cells with 27-cm2 area have been produced, with average AM0 load point efficiency of 21.4%. The next step in the evolution of this type of multijunction solar cell has been taken, with the development of triple-junction (TJ) Ga0.5In0.5P/GaAs/Ge cells. The addition of the germanium third junction, plus several significant improvements in the device structure, have led to a measured efficiency of 27.0% (AM0, 28°C) at Spectrolab on large-area (>30 cm2) TJ cells. The TJ cell is now in production at Spectrolab. Ga0.5In0.5P/GaAs/Ge cells are viable not only for non-concentrating space applications, but also for terrestrial and space concentrator systems. Efficiencies up to 32.3% at 47 suns under the terrestrial AM1.5D spectrum have been achieved.
Keywords :
Multijunction solar cells , concentrator , MOVPE , Radiation hardness
