Optical band gaps, Eg, up to 0.5 eV higher than in single-crystal samples, are observed for chemically deposited films of CdSe and explained in terms of a quantum-size effect, whereby the electrons are localized in individual crystallites. The increase in Eg depends strongly on deposition temperature, with the greatest increase obtained at the lowest temperature. Annealing at temperatures above the deposition temperature causes a decrease in Eg; this decrease is stronger at higher annealing temperature. Structural studies of the as-deposited layers showed them to be composed of microcrystalline, cubic CdSe, and electron microscopy resolved them into individual crystallites of typically 4080-A diameter, depending on deposition temperature. This is the first example reported of a three-dimensional quantum-size effect in a film. © 1987 The American Physical Society.

Three-dimensional quantum-size effect in chemically deposited cadmium selenide films / Hodes, Gary; Ana Albu, Yaron; Decker, Franco; Motisuke, Paulo. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 36:8(1987), pp. 4215-4221. [10.1103/physrevb.36.4215]

Three-dimensional quantum-size effect in chemically deposited cadmium selenide films

DECKER, Franco;
1987

Abstract

Optical band gaps, Eg, up to 0.5 eV higher than in single-crystal samples, are observed for chemically deposited films of CdSe and explained in terms of a quantum-size effect, whereby the electrons are localized in individual crystallites. The increase in Eg depends strongly on deposition temperature, with the greatest increase obtained at the lowest temperature. Annealing at temperatures above the deposition temperature causes a decrease in Eg; this decrease is stronger at higher annealing temperature. Structural studies of the as-deposited layers showed them to be composed of microcrystalline, cubic CdSe, and electron microscopy resolved them into individual crystallites of typically 4080-A diameter, depending on deposition temperature. This is the first example reported of a three-dimensional quantum-size effect in a film. © 1987 The American Physical Society.
1987
01 Pubblicazione su rivista::01a Articolo in rivista
Three-dimensional quantum-size effect in chemically deposited cadmium selenide films / Hodes, Gary; Ana Albu, Yaron; Decker, Franco; Motisuke, Paulo. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 36:8(1987), pp. 4215-4221. [10.1103/physrevb.36.4215]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/460560
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