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Titolo:
CHARACTERIZATION OF SIGE QUANTUM-WIRE STRUCTURES BY CATHODOLUMINESCENCE IMAGING AND SPECTROSCOPY
Autore:
HIGGS V; LIGHTOWLERS EC; USAMI N; MINE T; FUKATSU S; SHIRAKI Y;
Indirizzi:
UNIV LONDON KINGS COLL,DEPT PHYS LONDON WC2R 2LS ENGLAND UNIV TOKYO,ADV SCI & TECHNOL RES CTR,MEGURO KU TOKYO 153 JAPAN
Titolo Testata:
Applied physics letters
fascicolo: 12, volume: 67, anno: 1995,
pagine: 1709 - 1711
SICI:
0003-6951(1995)67:12<1709:COSQSB>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-BEAM EPITAXY; PHOTOLUMINESCENCE; SI1-XGEX; WELLS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
V. Higgs et al., "CHARACTERIZATION OF SIGE QUANTUM-WIRE STRUCTURES BY CATHODOLUMINESCENCE IMAGING AND SPECTROSCOPY", Applied physics letters, 67(12), 1995, pp. 1709-1711

Abstract

SiGe quantum wire (QWR) structures grown by gas source molecular beamepitaxy have been characterized by cathodoluminescence (CL) imaging and spectroscopy. At T approximate to 5 K, the CL spectra obtained witha focused beam contain SiGe luminescence features associated with electron-hole plasma recombination. When the electron beam is defocused three separate SiGe no-phonon luminescence features and their transverse optic phonon replicas are observed. These features are related to recombination in the SiGe (100) quantum wells (QWs), SiGe (111) QWs, andthe SiGe QWRs. The high generation rates associated with the focused electron beam quenches the luminescence and results in electron-hole plasma recombination in the adjacent SiGe (100) QWs, and saturation of the radiative processes. Defocusing the electron beam reduces the injection level and nonradiative processes, enabling the SiGe bound exciton features to be observed. Monochromatic CL imaging of the SiGe (100) QWs show that at low temperatures the CL image is broadened by excitondiffusion and becomes sharper at higher temperatures (T=50-70K) reflecting nonexcitonic recombination. (C) 1995 American Institute of Physics.

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Documento generato il 03/07/20 alle ore 01:04:26