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Proceedings Paper

Shape and temperature dependence of hot carrier relaxation dynamics in spherical and elongated CdSe quantum dots
Author(s): Liangliang Chen; Hua Bao; Oleg V. Prezhdo; Xiulin Ruan
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Paper Abstract

Time-domain non-adiabatic ab initio simulations are performed to study the phonon-assisted hot electron relaxation dynamics in CdSe spherical quantum dots (QDs) and elongated quantum dots (EQDs). EQDs have a narrower band gap and denser electron and hole energy states than QDs. As temperature increases, band gap values will become smaller due to thermal expansion effect. Also more phonons are excited to scatter with electrons and thus result in a higher relaxation rate for hot electrons. Besides, it is also found in our simulation that hot electron relaxation rate in EQDs has a weaker temperature dependence than in QDs, which could be attributed to the larger thermal expansion in EQDs.

Paper Details

Date Published: 30 August 2010
PDF: 11 pages
Proc. SPIE 7758, Physical Chemistry of Interfaces and Nanomaterials IX, 77580T (30 August 2010); doi: 10.1117/12.863124
Show Author Affiliations
Liangliang Chen, Purdue Univ. (United States)
Hua Bao, Purdue Univ. (United States)
Oleg V. Prezhdo, Univ. of Washington (United States)
Xiulin Ruan, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 7758:
Physical Chemistry of Interfaces and Nanomaterials IX
Oleg V. Prezhdo, Editor(s)

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