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  1. 1 Acta Physica Polonica A

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  1. 1 1991

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  1. 1 Efros A. L.

  2. 1 Ekimov A. I.

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Optics of Zero Dimensional Semiconductor Systems

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Ekimov A. I., Efros A. L.
Acta Physica Polonica A
|
1991
|
vol. 79
|
issue 1
5-14
EN
The optical spectra of semiconductor microcrystals grown in transparent matrix of oxide glass are investigated. The size of microcrystals was varied in a controlled manner from a few tens to a few hundreds of angstroms. The microcrystal embedded in wide gap matrix represents three-dimensional potential well for electrons, holes and excitons. The optical properties of such zero-dimensional semiconductor structures are shown to be governed by the structure of energy spectra of confined electron-hole pairs. The phenomenon of the microcrystals ionization at interband optical excitation is observed. The Auger process in microcrystals containing two nonequilibrium electron-hole pairs is proposed to be responsible for this effect. The experimental dependencies of the ionization rate as a function of excitation intensity and the microcrystal size are in a good agreement with the theoretical predictions of the Auger recombiantion model.
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