Carrier relaxation dynamics of Znx Cd1-x Se/C core/shell nanocrystals with phase separation as studied by time-resolved cathodoluminescence

Y. Estrin; D. H. Rich; O. Moshe; Sayan Bhattacharyya; A. Gedanken

doi:10.1063/1.3257975

Carrier relaxation dynamics of Zn_x Cd_1-x Se/C core/shell nanocrystals with phase separation as studied by time-resolved cathodoluminescence

Y. Estrin, D. H. Rich, O. Moshe, Sayan Bhattacharyya, A. Gedanken

Department of Physics

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The optical properties and carrier relaxation kinetics of Zn_x Cd_1-x Se/C core/shell nanocrystals with compositional phase separation occurring on a ∼1-5 nm size scale were examined with time-resolved cathodoluminescence (CL) spectroscopy and imaging. The CL spectral lineshape was found to depend on the level of excitation, temperature, and the time-window during time-delayed spectroscopy. The kinetics of carrier thermalization and transfer between Cd-rich phase-separated regions and the homogenous ZnCdSe alloy were examined. We show that the rare phenomenon of compositional phase separation in II-VI nanocrystals leads to interesting and potentially useful optical properties.

Original language	English
Article number	181903
Journal	Applied Physics Letters
Volume	95
Issue number	18
DOIs	https://doi.org/10.1063/1.3257975
State	Published - 16 Nov 2009

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Carrier relaxation dynamics of Znx Cd1-x Se/C core/shell nanocrystals with phase separation as studied by time-resolved cathodoluminescence",

abstract = "The optical properties and carrier relaxation kinetics of Znx Cd1-x Se/C core/shell nanocrystals with compositional phase separation occurring on a ∼1-5 nm size scale were examined with time-resolved cathodoluminescence (CL) spectroscopy and imaging. The CL spectral lineshape was found to depend on the level of excitation, temperature, and the time-window during time-delayed spectroscopy. The kinetics of carrier thermalization and transfer between Cd-rich phase-separated regions and the homogenous ZnCdSe alloy were examined. We show that the rare phenomenon of compositional phase separation in II-VI nanocrystals leads to interesting and potentially useful optical properties.",

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AU - Estrin, Y.

AU - Rich, D. H.

AU - Moshe, O.

AU - Bhattacharyya, Sayan

AU - Gedanken, A.

PY - 2009/11/16

Y1 - 2009/11/16

N2 - The optical properties and carrier relaxation kinetics of Znx Cd1-x Se/C core/shell nanocrystals with compositional phase separation occurring on a ∼1-5 nm size scale were examined with time-resolved cathodoluminescence (CL) spectroscopy and imaging. The CL spectral lineshape was found to depend on the level of excitation, temperature, and the time-window during time-delayed spectroscopy. The kinetics of carrier thermalization and transfer between Cd-rich phase-separated regions and the homogenous ZnCdSe alloy were examined. We show that the rare phenomenon of compositional phase separation in II-VI nanocrystals leads to interesting and potentially useful optical properties.

AB - The optical properties and carrier relaxation kinetics of Znx Cd1-x Se/C core/shell nanocrystals with compositional phase separation occurring on a ∼1-5 nm size scale were examined with time-resolved cathodoluminescence (CL) spectroscopy and imaging. The CL spectral lineshape was found to depend on the level of excitation, temperature, and the time-window during time-delayed spectroscopy. The kinetics of carrier thermalization and transfer between Cd-rich phase-separated regions and the homogenous ZnCdSe alloy were examined. We show that the rare phenomenon of compositional phase separation in II-VI nanocrystals leads to interesting and potentially useful optical properties.

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JO - Applied Physics Letters

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ER -

Carrier relaxation dynamics of Zn_x Cd_1-x Se/C core/shell nanocrystals with phase separation as studied by time-resolved cathodoluminescence

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