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

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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.

Original languageEnglish
Article number181903
JournalApplied Physics Letters
Volume95
Issue number18
DOIs
StatePublished - 16 Nov 2009

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