Charge Retention in Quantized Energy Levels of Nanocrystals

Details Charge Retention in Quantized Energy Levels of Nanocrystals Charge Retention in Quantized Energy Levels of Nanocrystals

2006-05-07

arxiv.org/abs/cond-mat/0605168v2

Physics

Condensed Matter

Other Condensed Matter

10 pages, 5 figures

Scientific paper

Understanding charging mechanisms and charge retention dynamics of nanocrystal memory devices is important in optimization of device design. Capacitance spectroscopy on PECVD grown germanium nanocrystals embedded in a silicon oxide matrix was performed. Dynamic measurements of discharge dynamics are carried out. Charge decay is modelled by assuming storage of carriers in the ground states of nanocrystals and that the decay is dominated by direct tunnelling. Discharge rates are calculated using the theoretical model for different nanocrystal sizes and densities and are compared with experimental data. Experimental results agree well with the proposed model and suggest that charge is indeed stored in the quantized energy levels of the nanocrystals.

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