Dimensional reduction in II-VI materials: A2Cd3Q 4 (A = K, Q = S, Se, Te; A = Rb, Q = S, Se), novel ternary low-dimensional cadmium chalcogenides produced by incorporation of A 2Q in CdQ

Enos A. Axtell, Ju Hsiou Liao, Zoe Pikramenou, Mercouri G. Kanatzidis

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Abstract

The synthesis of the isomorphous, layered chalcogenides K 2Cd3S4 (I), Rb2Cd3S 4 (II), K2Cd3Se4 (III), Rb 2Cd3Se4 (IV), and K2Cd 3Te4 (V) in molten A2Qx fluxes is reported (A = K, Rb; Q = S, Se, Te; x = 2 to 3). The compounds form as (Cd 3Q4)n2n- layers interspersed with A+ cations; the layers are composed of Cd3Q 42- units shaped as truncated cubes. The compounds have room-temperature band gaps of 2.75, 2.92, 2.36, 2.37, and 2.26 eV for I, II, III, IV, and V, respectively, and also display strong photoluminescence. The thermal analysis data for all compounds are reported. The properties of these compounds are compared with those of the three-dimensional compounds CdS, CdSe, and CdTe, as well as those of the nanometer-sized CdQ clusters. A conceptual context is presented to connect all these different types of compounds.

Original languageEnglish
Pages (from-to)656-666
Number of pages11
JournalChemistry - A European Journal
Volume2
Issue number6
DOIs
Publication statusPublished - Dec 1 1996

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Keywords

  • Cadmium compounds
  • Chalcogen compounds
  • Crystal structure
  • Dimensionality
  • Photoluminescence

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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