Optics of Zero Dimensional Semiconductor Systems

• Authors: A.I. Ekimov , Al.L. Efros
• Languages of publication: EN

Abstracts

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.

Keywords

EN

78.90.+t

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1991
• Volume: 79
• Issue: 1
• Pages: 5-14

Dates

published

1991-01

received

1990-08-08

Contributors

author

A.I. Ekimov

• S.I. Vavilov State Optical Institute, 199164 Leningrad, USSR

author

Al.L. Efros

• S.I. Vavilov State Optical Institute, 199164 Leningrad, USSR