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Exciton Thermoabsorption of GaSe 1− x S x Solid Solutions
Author(s) -
Angelini V.,
Casalboni M.,
Grandolfo M.,
Vecchia P.
Publication year - 1981
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221050105
Subject(s) - classification of discontinuities , exciton , solid solution , absorption (acoustics) , solid state , materials science , liquid nitrogen , analytical chemistry (journal) , thermodynamics , condensed matter physics , chemistry , physics , mathematics , metallurgy , organic chemistry , mathematical analysis , composite material
Results are reported obtained at liquid nitrogen temperature by thermally modulating the absorption of GaSe 1− x S x solid solutions. In order to clarify the relations among different polytypes, their optical properties, and growth methods, a complete series of measurements is performed, varying the compositional parameter x from 0 to 1, for single crystals grown both from the vapour and from the melt. The results are consistent with the existence of a unique polytype (ε) for x ≈ 0 in crystals grown by both methods. Discontinuities in the exciton ground state energy E 0 versus x curves are related to interpolytype transitions, namely γ → β andε → β, for melt‐ and vapour‐grown crystals, respectively.