ch9 - ECE3500SemiconductorMaterials andDevices...

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    Topic 9 : Electrons and Holes in               Semiconductors                       Fall 2007 ECE 3500 - Semiconductor Materials  and Devices
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    Learning Objectives In this topic you will learn: The concept of effective mass and its  value for different materials. The concept of a “hole”. How impurity doping affects the  conductivity of a semiconductor. How to calculate the binding energy of an  electron to an impurity atom in a  semiconductor. 
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    Electrons and Holes Shockley Parking garage analogy
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    Effective Mass The  effective mass   of an electron or hole is the mass of the charge carrier that may be used in calculations and takes into account the interaction of the charge carrier with the lattice.
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    Effective Mass (cont’d) The effective mass of an e -  is given by:            Ge       Si       GaAs
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This note was uploaded on 03/11/2010 for the course ECE 4350 taught by Professor Singh during the Spring '07 term at Villanova.

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ch9 - ECE3500SemiconductorMaterials andDevices...

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