Landau levels of the C-exciton in CuInSe2 studied by magneto-transmission

M. V. Yakushev, A. V. Rodina, G. M. Shuchalin, R. P. Seisian, M. A. Abdullaev, A. Rockett, V. D. Zhivulko, A. V. Mudryi, C. Faugeras, R. W. Martin

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Abstract

The electronic structure of the solar cell absorber CuInSe2 is studied using magneto-transmission in thin polycrystalline films at magnetic fields up to 29 T. A, B, and C free excitons are resolved in absorption spectra at zero field and a Landau level fan generated by diamagnetic exciton recombination is observed for fields above 7 T. The dependence of the C band exciton binding energy on magnetic fields, calculated using a hydrogenic approximation, is used to determine the C exciton Rydberg at 0 T (8.5 meV), band gap (1.2828 eV), and hole effective mass mso = (0.31 ± 0.12)m0 for the C valence sub-band.

Original languageEnglish
Article number142103
Number of pages4
JournalApplied Physics Letters
Volume105
Issue number14
Early online date9 Oct 2014
DOIs
Publication statusPublished - Oct 2014

Keywords

  • excitons
  • magnetic fields
  • absorption spectra

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