Multi-junction solar cells

Highest efficiency compound semiconductor multi-junction solar cells are becoming increasingly more important for terrestrial concentrator photovoltaics (CPV). In space applications III/V-based solar cells play a major role for decades by now as a reliable and efficient energy source (e.g., for satellites). Each single cell in such a multi-junction device needs to be optimized for converting a certain part of the sun spectrum efficiently.  This places high demands on the band gap engineering, lattice matching and crystalline quality of the used semiconductor materials and with that on the applied epitaxy processes. NAsPIII/V has established R&D programs for the next generation of multi-junction solar cells on GaAs, Ge- as well as Si-substrates. These R&D efforts of NAsPIII/V are based on cooperation contracts with the Material Sciences Center at Philipps-University Marburg (Germany) as well as other universities, research institutions and industrial partners [publications]