Polarized Raman and photoluminescence study on silicon quantum wires

Papadimitriou, D; Nassiopoulou, AG

dc.contributor.author	Papadimitriou, D	en
dc.contributor.author	Nassiopoulou, AG	en
dc.date.accessioned	2014-03-01T01:14:04Z
dc.date.available	2014-03-01T01:14:04Z
dc.date.issued	1998	en
dc.identifier.issn	0021-8979	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12842
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0001178191&partnerID=40&md5=7219b635c85be8ad2e90264511523628	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	POROUS SILICON	en
dc.subject.other	EMISSION	en
dc.subject.other	SI	en
dc.title	Polarized Raman and photoluminescence study on silicon quantum wires	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	A detailed Raman and photoluminescence study was performed on Si quantum wires fabricated on crystalline silicon (100). A shift of the phonon frequency was observed indicative of a compressive stress of about 9.5 kbar, possibly originating from the oxide skin grown on the wire surface by high temperature thermal oxidation. A splitting of the Raman phonon was also observed and interpreted as originating from the existing stress and/or from the excitation of phonons polarized parallel and normal to the direction of confinement. The photoluminescence emission was found to depend on the excitation wavelength and on the polarization of the laser beam. The energy and efficiency of the emitted luminescence increased with decreasing laser wavelength. This was interpreted as an effect due to the size distribution of the studied wires, since thin wires with a higher band gap than thick wires can be excited by shorter laser wavelengths. The photoluminescence efficiency was significantly higher when the laser beam was polarized in the direction of confinement in agreement with theoretical predictions. The emitted luminescence was also polarized preferentially in the direction of confinement. This resulted in depolarization of the emitted light when the laser beam was polarized along the wire axis, normal to the direction of confinement. (C) 1998 American Institute of Physics. [S0021-8979(98)06114-3].	en
heal.publisher	AMER INST PHYSICS	en
heal.journalName	Journal of Applied Physics	en
dc.identifier.isi	ISI:000075257800058	en
dc.identifier.volume	84	en
dc.identifier.issue	2	en
dc.identifier.spage	1059	en
dc.identifier.epage	1063	en