High-resolution electron microscopy and microanalysis of cds and cdte quantum dots in glass matrices

Li-Chi Liu, M. J. Kim, Subhash H. Risbud, R. W. Carpenter

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Abstract

CdS and CdTe quantum dots (QDs) precipitated from borosilicate glass matrices, exhibiting quantum confinement effects, have been characterized by optical spectroscopy and high-spatial-resolution electron microscopy. The particles appear to have formed initially by homogeneous nucleation and were randomly distributed, but the morphology of the particles and therefore growth processes differ. The CdTe particles were spherical single crystals, often with small facets on {111} planes, or at most bicrystals. The measured average diameter of these particles was about 14 nm. They had a zinc-blende cubic structure with lattice constant corresponding to bulk CdTe crystals. For CdS the particles were relatively large polycrystals, composed of smaller single crystals, whose size was about 3·3 nm. The structure of these nanocrystals was wurzite-type hexagonal, with a lattice corresponding to CdS. Particle-size effects on absorption peak shifts were observed for both CdTe and CdS samples. Microscopically observed QD sizes were compared with predictions of theoretical models based on optical absorption features of quantum confined structures.

Original languageEnglish
Pages (from-to)769-776
Number of pages8
JournalPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
Volume63
Issue number3
DOIs
Publication statusPublished - 1991 Jan 1

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High resolution electron microscopy
Microanalysis
microanalysis
Semiconductor quantum dots
electron microscopy
quantum dots
Single crystals
Bicrystals
Glass
Quantum confinement
Borosilicate glass
glass
high resolution
Polycrystals
matrices
Crystal lattices
Nanocrystals
Light absorption
Electron microscopy
Lattice constants

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "CdS and CdTe quantum dots (QDs) precipitated from borosilicate glass matrices, exhibiting quantum confinement effects, have been characterized by optical spectroscopy and high-spatial-resolution electron microscopy. The particles appear to have formed initially by homogeneous nucleation and were randomly distributed, but the morphology of the particles and therefore growth processes differ. The CdTe particles were spherical single crystals, often with small facets on {111} planes, or at most bicrystals. The measured average diameter of these particles was about 14 nm. They had a zinc-blende cubic structure with lattice constant corresponding to bulk CdTe crystals. For CdS the particles were relatively large polycrystals, composed of smaller single crystals, whose size was about 3·3 nm. The structure of these nanocrystals was wurzite-type hexagonal, with a lattice corresponding to CdS. Particle-size effects on absorption peak shifts were observed for both CdTe and CdS samples. Microscopically observed QD sizes were compared with predictions of theoretical models based on optical absorption features of quantum confined structures.",
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AU - Risbud, Subhash H.

AU - Carpenter, R. W.

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N2 - CdS and CdTe quantum dots (QDs) precipitated from borosilicate glass matrices, exhibiting quantum confinement effects, have been characterized by optical spectroscopy and high-spatial-resolution electron microscopy. The particles appear to have formed initially by homogeneous nucleation and were randomly distributed, but the morphology of the particles and therefore growth processes differ. The CdTe particles were spherical single crystals, often with small facets on {111} planes, or at most bicrystals. The measured average diameter of these particles was about 14 nm. They had a zinc-blende cubic structure with lattice constant corresponding to bulk CdTe crystals. For CdS the particles were relatively large polycrystals, composed of smaller single crystals, whose size was about 3·3 nm. The structure of these nanocrystals was wurzite-type hexagonal, with a lattice corresponding to CdS. Particle-size effects on absorption peak shifts were observed for both CdTe and CdS samples. Microscopically observed QD sizes were compared with predictions of theoretical models based on optical absorption features of quantum confined structures.

AB - CdS and CdTe quantum dots (QDs) precipitated from borosilicate glass matrices, exhibiting quantum confinement effects, have been characterized by optical spectroscopy and high-spatial-resolution electron microscopy. The particles appear to have formed initially by homogeneous nucleation and were randomly distributed, but the morphology of the particles and therefore growth processes differ. The CdTe particles were spherical single crystals, often with small facets on {111} planes, or at most bicrystals. The measured average diameter of these particles was about 14 nm. They had a zinc-blende cubic structure with lattice constant corresponding to bulk CdTe crystals. For CdS the particles were relatively large polycrystals, composed of smaller single crystals, whose size was about 3·3 nm. The structure of these nanocrystals was wurzite-type hexagonal, with a lattice corresponding to CdS. Particle-size effects on absorption peak shifts were observed for both CdTe and CdS samples. Microscopically observed QD sizes were compared with predictions of theoretical models based on optical absorption features of quantum confined structures.

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