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Class2_slides - Physical Electronics EE.338 Class 2 Steve...

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Steve Cronin University of Southern California Electrical Engineering - Electrophysics Physical Electronics EE.338 Class 2
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Chapter 1: Crystal Structure
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Semiconductor Crystal Structures Diamond structure – crystalline structure of Si, Ge, diamond It is a face centered cubic crystal with two atoms per site. It results from the covalent bonding of the atoms in a tetrahedral arrangement. The tetrahedron is the basic building block of these materials. Silicon
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Compound Semiconductors Many compound semiconductors are formed in the zincblende crystal structure as shown above. This structure is similar to the diamond structure except every other atom site alternates between the two atoms that make up the crystal. It is a fcc structure with 2 atoms per site. GaAs
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5 Bravais Lattices (2D) Bravais lattice , named after Auguste Bravais, is an infinite set of points generated by a set of discrete translation operations.
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14 Bravais Lattices (3D)
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Czochralski Growth Bulk crystal growth Liquid-solid interface well-oriented crystallity Used widely for Si, GaAs, and InP Cylinders are sliced into wafers.
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e e r E + r J = σ r E current: conductivity (measured) + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + crystalline conductor (e.g. copper)
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Class2_slides - Physical Electronics EE.338 Class 2 Steve...

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