Mobility and Spatial Distribution of Photoexcited Electrons in CdSe/CdS Nanorods
The Journal of Physical Chemistry C2013Vol. 117(6), pp. 3146–3151
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Abstract
The mobility and spatial distribution of photoexcited electrons in CdSe/CdS core/shell nanorods was studied using optical-pump THz-probe spectroscopy. Measurements were conducted on two samples, differing in rod length. After photoexcitation the hole localizes in the CdSe core within a picosecond, while the electron delocalizes around the core. Analysis of the THz mobility with a model of one-dimensional electron diffusion on a finite rod yields an electron delocalization of ∼25% into the CdS shell and a mobility of 700 cm2/(V s). This is one and a half times the mobility value for bulk CdS, which can be due to quantum confinement effects on electron–phonon scattering and electronic structure.
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