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EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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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.