Optical Properties near the Fundamental Edge of an AgGaS2 Single Crystal

概要

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The exciton energies of the $A$ and $BC$ excitons, which correspond, respectively, to the transitions from the uppermost valence band and the lower valence bands to the conduction band, in an AgGaS2 single crystal have been evaluated by analyzing polarized reflectivity spectra in the temperature range 77–294 K. The $A$ exciton energy is estimated to be 2.701 eV, in agreement with the findings of other researchers, at 77 K. The energy difference between the $A$ and $BC$ excitons is 270 meV and almost independent of temperature. Cathodoluminescence spectra have two peaks over the measured temperature range. The one at the higher photon energy is interpreted as the decay of the $A$ exciton in consideration of the electron-beam voltage dependence on the peak position.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
1989-02-20