DETAILED XPS AND UPS STUDIES OF THE BAND-STRUCTURE OF ZINC-OXIDE

The X-ray photoelectron spectra of zinc oxide were measured in a wide range of quantum energies (30-150 and 1253.6 eV). It is shown that the form of the spectrum of the valence O2p-band depends on the energy of the incident quantum. The most probable reason for the change in the form of the O2p-band spectra is an admixture of Zn3d-electrons, which, along with Zn4s-electrons, take part in covalent bonding of Zn and O. The dependence of the integral intensity ratio of the O2p-band to the intensity of the Zn3d peak on hv war analyzed due to which the percen t of the admixture of the Zn3d-states in the O2p-band was determined t o be 9%. The stoichiometry and the depth of the profile of the concent ration ratio were calculated taking into account the fraction of the Z n3d-electrons participating in the bond.