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Proceedings Paper

Comparison of the femtosecond time-resolved excited state dynamics in copper oxide and copper sulfide quantum dots
Author(s): Yongbing Lou; Clemens Burda; Ming Yin; Stephen O'Brien
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Paper Abstract

The relaxation dynamics of Cu2O and Cu1.8S quantum dots (QDs) are compared via time-resolved femtosecond pump probe experiments. It is found that Cu2O shows extremely long-lived excited states on the microsecond time scale and Cu1.8S exhibits much shorter lifetimes in the picosecond time regime. While copper sulfide systems are described in the literature as p-type direct band gap materials, the Cu2O system is direct band gap, however it has a forbidden lowest-energy state. These differences are expressed in the different lifetimes displayed in the time-resolved femtosecond and nanosecond measurements. Moreover, it is confirmed by photoluminescence spectroscopy that reveals that only the Cu1.8S QDs show efficient PL and the Cu2O QDs do not luminescence. In all of the systems, carrier trapping is probably the lifetime limiting process for the conduction band edge depopulation.

Paper Details

Date Published: 14 October 2004
PDF: 10 pages
Proc. SPIE 5513, Physical Chemistry of Interfaces and Nanomaterials III, (14 October 2004); doi: 10.1117/12.556695
Show Author Affiliations
Yongbing Lou, Case Western Reserve Univ. (United States)
Clemens Burda, Case Western Reserve Univ. (United States)
Ming Yin, Columbia Univ. (United States)
Stephen O'Brien, Columbia Univ. (United States)

Published in SPIE Proceedings Vol. 5513:
Physical Chemistry of Interfaces and Nanomaterials III
Gregory V. Hartland; Xiao-Yang Zhu, Editor(s)

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