ECE474S09_Lecture03 - ECE 474: Principles of Electronic...

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ECE 474: Principles of Electronic Devices Prof. Virginia Ayres Electrical & Computer Engineering Michigan State University ayresv@msu.edu
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Lecture 02 & Lecture 03: Decisions from Monday:
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Lecture 03: Physical Structures: Cubic systems: bcc, fcc, diamond, zinc-blende Number of atoms Packing fraction Nearest neighbor distances Density Hexagonal systems: Planar: graphene, CNTs
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Lecture 03: Physical Structures: Cubic systems: bcc, fcc, diamond, zinc-blende Number of atoms Packing fraction Nearest neighbor distances Density Hexagonal systems: Planar: graphene, CNTs
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WHY: Packing Fraction The Packing Fraction approximates the amount of lattice volume tied up in bonds. How to calculate the Packing Fraction approximation: Find the fraction of the Unit Cell filled with hard spheres.
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WHY: Packing Fraction Cubic Systems: sc bcc fcc diamond Packing Fraction (%) Z Z Z Z The Packing Fraction approximates the amount of lattice volume tied up in bonds. How to calculate the Packing Fraction approximation: Find the fraction of the Unit Cell filled with hard spheres.
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Density: Density is measured grams/cm 3 . Calculate the Density from the Unit cell volume , # of atoms inside the Unit cell , atomic weight(s) of each type of atom and Avogadro's number. Avogadro’s number: 6.02 x10
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ECE474S09_Lecture03 - ECE 474: Principles of Electronic...

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