ECE474S09_Lecture02 - ECE 474: Principles of Electronic...

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Unformatted text preview: ECE 474: Principles of Electronic Devices Prof. Virginia Ayres Electrical & Computer Engineering Michigan State University ayresv@msu.edu Lecture 02: Decisions from Monday: Lecture 02: Physical Structures: Cubic systems: bcc, fcc, diamond, zinc-blende Number of atoms Packing fraction Nearest neighbor distances Effective repeat unit = Unit Cell Cubic Systems: 1. Atomic arrangements 2. Sizes of the box a Effective repeat unit = Unit Cell Example: bcc Need the atoms in the box, then can stack the Unit Cells sideways or up to make a crystal. Correctly counting atoms in the box: Corner atom: 1/8 atom IN box Face atom: atom IN box Inside atom: 1 atom IN box Correctly counting atoms in the box: Corner atom: 1/8 atom IN box Face atom: atom IN box Inside atom: 1 atom IN box Example: Cr (bcc) 8 x 1/8 = 1 0 x = 0 1 x 1 = 1 Atoms in box = 2 Correctly counting atoms in the box: Corner atom: 1/8 atom IN box Face atom: atom IN box Inside atom: 1 atom IN box Example: Cu (fcc) Correctly counting atoms in the box: Corner atom: 1/8 atom IN box Face atom: atom IN box Inside atom: 1 atom IN box Example: Cu (fcc) 8 x 1/8 = 1 6 x = 3 0 x 1 = 0 Atoms in box = 4 Correctly counting atoms in the box: Corner atom: 1/8 atom IN box Face atom: atom IN box Inside atom: 1 atom IN box Example: Si (D) Correctly counting atoms in the box:...
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This note was uploaded on 04/14/2009 for the course ECE 474 taught by Professor Ayres during the Spring '09 term at Michigan State University.

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ECE474S09_Lecture02 - ECE 474: Principles of Electronic...

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