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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Optical spectroscopy of free excitons in a cuins2 chalcopyrite semiconductor compound

Mudryi, A.V. and Ivanyukovich, A.V. and Yakushev, M.V. and Martin, Robert and Saad, A. (2008) Optical spectroscopy of free excitons in a cuins2 chalcopyrite semiconductor compound. Semiconductors, 42 (1). pp. 29-33. ISSN 1063-7826

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Abstract

The spectra of reflectance and luminescence of high-quality CuInS2 single crystals grown by oriented crystallization are studied at the temperature 4.2 K. In the region of the fundamental absorption edge, the two excitonic resonance reflectance peaks, nondegenerate peak A at the energy ∼1.5356 eV and doubly degenerate peak BC at the energy ∼1.5567 eV, and the luminescence signal produced by free and bound excitons are observed. The luminescence lines, A UPB at ∼1.5361 eV and A LPB at ∼1.5347 eV, with a half-width ∼1 meV, are attributed to exciton-polariton recombination. From the experimentally observed energy position of the exciton ground state and excited states, the binding energy of free excitons is determined to be ∼18.5 meV. In studying the photoluminescence in magnetic fields up to 10 T, a diamagnetic shift of the ground state of free excitons A is observed.