Shape and temperature dependence of hot carrier relaxation dynamics in spherical and elongated CdSe quantum dots

Liangliang Chen; Hua Bao; Oleg V. Prezhdo; Xiulin Ruan

doi:10.1117/12.863124

30 August 2010 Shape and temperature dependence of hot carrier relaxation dynamics in spherical and elongated CdSe quantum dots

Liangliang Chen, Hua Bao, Oleg V. Prezhdo, Xiulin Ruan

Author Affiliations +

Proceedings Volume 7758, Physical Chemistry of Interfaces and Nanomaterials IX; 77580T (2010) https://doi.org/10.1117/12.863124
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

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.

Citation Download Citation

Liangliang Chen, Hua Bao, Oleg V. Prezhdo, and Xiulin Ruan "Shape and temperature dependence of hot carrier relaxation dynamics in spherical and elongated CdSe quantum dots", Proc. SPIE 7758, Physical Chemistry of Interfaces and Nanomaterials IX, 77580T (30 August 2010); https://doi.org/10.1117/12.863124

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