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Keywords:

  • chalcopyrites;
  • CuInSe2;
  • interfaces;
  • molecular beam epitaxy;
  • solar cells;
  • ZnO

The interface formation between epitaxial CuInSe2(112) films and ZnO deposited by metal-organic MBE is investigated by photoelectron spectroscopy. Reaction of diethyl-zinc with CuInSe2 leads to the formation of an intrinsic ZnSe layer and copper depletion of the interface. This is associated with Zn doping of the chalcopyrite surface and a Fermi-level shift toward the conduction band. The implications on the band alignment are discussed.