Carrier relaxation dynamics of ZnxCd1-xSe/C core/shell nanocrystals with phase separation as studied by time-resolved cathodoluminescence

Estrin, Y.; Rich, D. H.; Moshe, O.; Bhattacharyya, Sayan; Gedanken, A.
November 2009
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p181903
Academic Journal
The optical properties and carrier relaxation kinetics of ZnxCd1-xSe/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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