Excited states of the A and B free excitons in CuInSe2

Michael V. Yakushev, Franziska Luckert, Clement Faugeras, Anatoli V. Karotki, Alexander V. Mudryi, Robert W. Martin

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1 Citation (Scopus)

Abstract

CuInSe2 single crystals, grown by the vertical Bridgman technique were studied using polarisation resolved photoluminescence (PL) at cryogenic temperatures. The emission lines related to the first (n = 2) excited states for the A and B free excitons were observed in the PL spectra at 1.0481 and 1.0516 eV, respectively. The spectral positions of these lines were used to estimate accurate values for the A and B exciton binding energies (8.5 and 8.4 meV, respectively), Bohr radii (7.5 nm), band gaps (E-g(A) = 1.050 eV and E-g(B) = 1.054 eV), and the static dielectric constant (11.3) assuming the hydrogenic model.

Original languageEnglish
Article number05FC03
Number of pages2
JournalJapanese Journal of Applied Physics
Volume50
Issue number5
DOIs
Publication statusPublished - May 2011

Keywords

  • optical properties
  • single crystals

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