Raman spectroscopy of PbTe/CdTe nanocrystals

We studied the evolution of Raman signals stemming from colloidal PbTe/CdTe nanocrystals (NCs). The NCs were grown using the cation exchange method and samples having different amounts of CdTe as shell material were investigated. The observed Raman bands are correlated to pure tellurium modes and af...

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Veröffentlicht in:	Physica Status Solidi (b) 2011-11, Vol.248 (11), p.2748-2750
Hauptverfasser:	Tschirner, Norman, Lange, Holger, Lambert, Karel, Hens, Zeger, Thomsen, Christian
Format:	Artikel
Sprache:	eng
Schlagworte:	Bands Cadmium tellurides Condensed matter: electronic structure, electrical, magnetic, and optical properties core shell Exact sciences and technology Intermetallics Lead base alloys Lead tellurides Nanocrystals Nanocrystals and nanoparticles Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures PbTe Physics quantum dots Raman spectroscopy Shells Tellurium
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Beschreibung
Zusammenfassung:	We studied the evolution of Raman signals stemming from colloidal PbTe/CdTe nanocrystals (NCs). The NCs were grown using the cation exchange method and samples having different amounts of CdTe as shell material were investigated. The observed Raman bands are correlated to pure tellurium modes and after introduction of CdTe its longitudinal optical (LO) mode becomes also visible. The tellurium modes' intensity rapidly decreases after cationic exchange due to the chemical bonding of the vacant tellurium atoms.
ISSN:	0370-1972 1521-3951 1521-3951
DOI:	10.1002/pssb.201100222