Energy of free excitons in CuInSe[sub 2] single crystals

Yakushev, M. V.; Mudryi, A. V.; Tomlinson, R. D.
May 2003
Applied Physics Letters;5/12/2003, Vol. 82 Issue 19, p3233
Academic Journal
CuInSe[SUB2] single crystals grown by the vertical Bridgman method were studied using photoluminescence (PL) and optical reflection (OR) at temperatures 4.2 and 78 K. A and B free-exciton peaks were well resolved in both the PL and OR spectra measured at a low temperature from a number of samples. The energy, spectral separation, and the width of the excitonic lines varied considerably for samples with different elemental compositions. The closer to the ideal stoichiometry, the higher the energies and the smaller the A-B separation. Similar changes in the excitonic spectra were revealed for a temperature rise from 4.2 up to 78 K. These measurements explain the scatter in the excitonic parameters and the band-gap values measured in the present work and reported in the literature.


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