02 - Crystal structure

02 - Crystal structure - EECS 320 Crystal Structure...

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EECS 320 Crystal Structure J. Phillips EECS 320 Material Requirements What can we use? Electrical conduction Range of conducting to insulating Solid state Types of solids Crystalline Amorphous Polycrystalline
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J. Phillips EECS 320 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 Common Semiconductors
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J. Phillips EECS 320 Semiconductor Crystal Structure Diamond Zinc Blende 0 , 2 , 2 a a 4 , 4 , 4 a a a (Si, Ge) (GaAs, InP, AlSb, …) Ga As J. Phillips EECS 320 Semiconductor Wafers Boule
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J. Phillips EECS 320 Semiconductor Wafers Atomic arrangement not symmetric in all directions Chemical and electronic properties will depend on atomic arrangement Need a method of specifying atomic arrangement or
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02 - Crystal structure - EECS 320 Crystal Structure...

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