02 - Crystal structure _ semiconductor models

02 - Crystal structure _ semiconductor models - Crystal...

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Crystal Structure & Semiconductor Models Why semiconductors need to have high purity? Why materials for IC devices need to be in crystalline form? What is the crystal structure of Si and GaAs? How energy bands are formed? Where do electrons and hole come from? How conductor, insulator and semiconductor are classified?
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Material Requirements What can we use? Electrical conduction Range of conducting to insulating Solid state Types of solids
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Crystal Structure Lattice Unit cell Periodic arrangement of atoms in a crystal Small volume of crystal that may be used to reproduce the entire crystal Primitive unit cell Smallest unit cell that describes the crystal Body centered cubic (BCC) Simple cubic lattice constant a Lattice constant is a material parameter
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Common Semiconductors
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Semiconductor Crystal Structure Diamond Zinc Blende 0 , 2 , 2 a a 4 , 4 , 4 a a a (Si, Ge) (GaAs, InP, AlSb, …) Ga As
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Si crystal growth SINGLE-CRYSTAL GROWTH
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This note was uploaded on 07/22/2011 for the course EECS 320 taught by Professor Sun during the Fall '10 term at University of Florida.

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02 - Crystal structure _ semiconductor models - Crystal...

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