Journal of Chemical Physics, volume 80, issue 9, pages 4464-4469

Size effects in the excited electronic states of small colloidal CdS crystallites

R Rossetti 1
J L Ellison 1
J. M. Gibson 1
L E Brus 1
1
 
Bell Laboratories, Murray Hill, New Jersey 07974
Publication typeJournal Article
Publication date1984-05-01
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor4.4
ISSN00219606, 10897690
Physical and Theoretical Chemistry
General Physics and Astronomy
Abstract

This paper reports experimental studies of the development of bulk optical properties as a function of crystallite size for the inorganic direct gap semiconductor CdS. Small crystallites are synthesized via colloidal chemical techniques, and their optical properties are studied in situ at extreme dilution. The crystallites are characterized via high resolution transmission electron microscopy. Direct images show (111) lattice planes, and establish the crystallite structures as close to those of excised fragments of bulk CdS (zinc-blende cubic). Large crystallites (> 100 Å average diameter) show an optical absorption, in colloidal solution, close to that of bulk crystalline material. However, small crystallites of 30 Å average diameter show a large blue shift (∼0.8 eV) in absorption edge (effective band gap), and an intensification of edge absorption relative to absorption at higher energy regions. These observations can be understood as quantum size effects resulting from confinement of an electron and hole in a small volume. 40 Å average size crystallites show a smaller shift (∼0.25 eV), and corresponding changes in their fluorescence, and resonance Raman excitation, spectra.

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GOST Copy
Rossetti R. et al. Size effects in the excited electronic states of small colloidal CdS crystallites // Journal of Chemical Physics. 1984. Vol. 80. No. 9. pp. 4464-4469.
GOST all authors (up to 50) Copy
Rossetti R., Ellison J. L., Gibson J. M., Brus L. E. Size effects in the excited electronic states of small colloidal CdS crystallites // Journal of Chemical Physics. 1984. Vol. 80. No. 9. pp. 4464-4469.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1063/1.447228
UR - https://doi.org/10.1063/1.447228
TI - Size effects in the excited electronic states of small colloidal CdS crystallites
T2 - Journal of Chemical Physics
AU - Rossetti, R
AU - Ellison, J L
AU - Gibson, J. M.
AU - Brus, L E
PY - 1984
DA - 1984/05/01 00:00:00
PB - American Institute of Physics (AIP)
SP - 4464-4469
IS - 9
VL - 80
SN - 0021-9606
SN - 1089-7690
ER -
BibTex |
Cite this
BibTex Copy
@article{1984_Rossetti,
author = {R Rossetti and J L Ellison and J. M. Gibson and L E Brus},
title = {Size effects in the excited electronic states of small colloidal CdS crystallites},
journal = {Journal of Chemical Physics},
year = {1984},
volume = {80},
publisher = {American Institute of Physics (AIP)},
month = {may},
url = {https://doi.org/10.1063/1.447228},
number = {9},
pages = {4464--4469},
doi = {10.1063/1.447228}
}
MLA
Cite this
MLA Copy
Rossetti, R., et al. “Size effects in the excited electronic states of small colloidal CdS crystallites.” Journal of Chemical Physics, vol. 80, no. 9, May. 1984, pp. 4464-4469. https://doi.org/10.1063/1.447228.
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