Excited states of the A and B free excitons in CuInSe2

Yakushev, Michael V. and Luckert, Franziska and Faugeras, Clement and Karotki, Anatoli V. and Mudryi, Alexander V. and Martin, Robert W. (2011) Excited states of the A and B free excitons in CuInSe2. Japanese Journal of Applied Physics, 50 (5). 05FC03. ISSN 0021-4922 (https://doi.org/10.1143/JJAP.50.05FC03)

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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.

ORCID iDs

Yakushev, Michael V., Luckert, Franziska, Faugeras, Clement, Karotki, Anatoli V., Mudryi, Alexander V. and Martin, Robert W. ORCID logoORCID: https://orcid.org/0000-0002-6119-764X;
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