Electronic energy band parameters of CuInSe2: Landau levels in magnetotransmission spectra

M. V. Yakushev, A. V. Rodina, R. P. Seisyan, Yu. E. Kitaev, S. A. Vaganov, M. A. Abdullaev, A. V. Mudryi, T. V. Kuznetsova, C. Faugeras, R. W. Martin

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Abstract

Magnetotransmission (MT) at magnetic fields up to 29 T was used to study the electronic structure of CuInSe2 in thin polycrystalline films. The zero field absorption spectra exhibited resolved A, B, and C free excitons. Quantum oscillations, due to diamagnetic excitons comprising electrons and holes from Landau levels quantized in the conduction and valence band, respectively, appeared in the MT spectra at fields over 5 T. Spectral energies of Landau levels and binding energies of the corresponding diamagnetic excitons, theoretically calculated assuming a quasicubic approximation of the CuInSe2 tetragonal lattice structure, helped to identify the character of the experimentally observed diamagnetic excitons. Spectral energies of diamagnetic excitons in the MT spectra with different circular polarizations were used to determine the electron and light hole effective masses, whereas heavy hole masses as well as the γ and
γ1 Luttinger parameters, Ep Kane energy, and F parameter of the influence of remote bands, as well as their polaron values, were calculated using the Luttinger theory.
Original languageEnglish
Article number235202
Number of pages6
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume100
Issue number23
DOIs
Publication statusPublished - 17 Dec 2019

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Keywords

  • electronic energy band parameters
  • CuInSe2
  • magnetotransmission spectra
  • MT
  • Landau levels
  • energies

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