Femtosecond Spectroscopy of Carrier Relaxation Dynamics in Type II CdSe/CdTe Tetrapod Heteronanostructures

Branched nanocrystal heterostructures synthesized from CdSe and CdTe exhibit a type II band structure alignment that induces separation of charge upon photoexcitation and localizes carriers to different regions of the tetrahedral geometry. The dynamics of carrier relaxation examined with femtosecond...

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Veröffentlicht in:	Nano letters 2005-09, Vol.5 (9), p.1809-1813
Hauptverfasser:	Peng, P, Milliron, D. J, Hughes, S. M, Johnson, Justin C, Alivisatos, A. Paul, Saykally, Richard J
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Condensed matter: structure, mechanical and thermal properties Electronics Exact sciences and technology Microelectronic fabrication (materials and surfaces technology) Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals Physics Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Structure of solids and liquids crystallography
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Beschreibung
Zusammenfassung:	Branched nanocrystal heterostructures synthesized from CdSe and CdTe exhibit a type II band structure alignment that induces separation of charge upon photoexcitation and localizes carriers to different regions of the tetrahedral geometry. The dynamics of carrier relaxation examined with femtosecond pump−probe spectroscopy showed heterostructures having rise times and biexponential decays longer than those of nanorods with similar dimensions. This is attributed to weaker interactions with surface states and nonradiative relaxation channels afforded by the type II alignment.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl0511667