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Diffusion coefficient to mobility ratio in low-dimensional nanostructures

Johari, Zaharah (2009) Diffusion coefficient to mobility ratio in low-dimensional nanostructures. Masters thesis, Universiti Teknologi Malaysia, Faculty of Electrical Engineering.

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Abstract

The devices are moving towards nanometer domain where modification to it conventional properties need to be made to fit the modification. Diffusion coefficient and mobility are two important parameters to be analyzed as it determine how well particle moves in a semiconductor. New improvement in semiconductors technology have brought to the shrinking of device dimensions from bulk (3-D) to 2-D nanostructures and further reduction of one or more Cartesian direction to nanoscale results in 1-D nanowire. In low dimensional devices the diffusion current cannot be neglected as it does for conventional devices. In degenerate regime, the diffusion coefficient becoming more important as the concentration gradient is emphasized. The degradation of mobility and diffusion coefficient of both nondegenerate and degenerately-doped low dimensional nanostructure with and without quantum emission is elaborated. The Einstein ratio that was established to be equal to the thermal voltage t V alter in degenerate approximation which shown to be a function of d ? depending on it dimensionalities. At higher electric field where quantum emission is present, the ratio is modified by the modulating factor. Present project has obtained extensions for the diffusion coefficient to the degraded mobility for both nondegenerate and degenerately-doped nanostructure with varying dimensionalities subjected to low and high electric field.

Item Type:Thesis (Masters)
Additional Information:Thesis (Sarjana Kejuruteraan Elektrik(Elektronik dan Telekomunikasi)) - Universiti Teknologi Malaysia, 2009; Supervisor : Prof. Dr. Vijay K. Arora
Uncontrolled Keywords:molecular electronics, nanotechnology
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:12425
Deposited By: Ms Zalinda Shuratman
Deposited On:01 Jun 2011 02:37
Last Modified:30 Jul 2012 07:11

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