Quantum size effects in optical properties of CdS-glass composites

Barrett G. Potter, Joseph H. Simmons

Research output: Contribution to journalArticle

226 Scopus citations

Abstract

The optical properties of extremely small isolated semiconductors provide a sensitive probe of the developing electronic structure in the materials. Cadmium sulfide and CdSxSe1-x crystallites are precipitated in an insulating glass matrix during a secondary heat-treatment procedure. Variation in the heat treatment significantly alters the final crystallite size, enabling the examination of a size-dependent change in the observed optical-absorption edge and exciton-related photoluminescence peak energies. A diffusion-limited coarsening behavior is exhibited by the CdS crystallites precipitated from a Zn-free base glass, indicating a high degree of purity in these crystals. Growth behavior of mixed crystallites, however, indicates some stoichiometric variation with heat-treatment time. Quantum size effects measured using the CdS precipitates in the size range from 40400 A reflect confinement primarily in the translational motion of the Wannier exciton with some slight modification of its internal electron and hole orbits.

Original languageEnglish (US)
Pages (from-to)10838-10845
Number of pages8
JournalPhysical Review B
Volume37
Issue number18
DOIs
StatePublished - Jan 1 1988
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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