ENERGY-BAND STRUCTURE OF CUINS2 CRYSTALS

In this work the reflectivity spectra and wave-length derivative refle ctivity (WDR) spectra of CuInS2 crystals have been investigated in the region E greater than or equal to E-g. The n = 1, n = 2 and n = 3 exc itonic states are determined and contours of exciton lines n = 1 are c alculated. The parameters of excitons and bands have been determined f or the region of band gap minimum. The main band gaps are determined f or Gamma-, N- and T-points of the Brillouin zone.