The structure of the fundamental absorption edge of thin CuIn(Te 0.15Se 0.85) 2 films

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The structure of the fundamental absorption edge of laser-deposited CuIn(Te 0.15Se 0.85 thin films is reported. The absorption coefficients and transition energies of the obtained films were determined using interferential reflectivity and transmission in the near IR and visible wavelength range. The absorption spectrum of CuIn(Te 0.15Se 0.85) 2 films shows three energy gaps which are associated with the fundamental edge and valence band splitting by the tetragonal crystal-field and spin-orbit effects and four optical transitions from copper d-levels admixed to p-levels of chalcogene in the uppermost valence bands.