Comparison of the femtosecond time-resolved excited state dynamics in copper oxide and copper sulfide quantum dots

Yongbing Lou; Clemens Burda; Ming Yin; Stephen O'Brien

doi:10.1117/12.556695

14 October 2004 Comparison of the femtosecond time-resolved excited state dynamics in copper oxide and copper sulfide quantum dots

Yongbing Lou, Clemens Burda, Ming Yin, Stephen O'Brien

Author Affiliations +

Proceedings Volume 5513, Physical Chemistry of Interfaces and Nanomaterials III; (2004) https://doi.org/10.1117/12.556695
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

The relaxation dynamics of Cu₂O and Cu_1.8S 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 Cu_1.8S 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 Cu_1.8S 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.

Citation Download Citation

Yongbing Lou, Clemens Burda, Ming Yin, and Stephen O'Brien "Comparison of the femtosecond time-resolved excited state dynamics in copper oxide and copper sulfide quantum dots", Proc. SPIE 5513, Physical Chemistry of Interfaces and Nanomaterials III, (14 October 2004); https://doi.org/10.1117/12.556695

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