ECE474S09_Lecture06 - 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 06: Finish Physical Structures: Planes and directions Energy landscape Interfaces Energy landscape of both materials Lecture 06: Finish Physical Structures: Planes and directions Low index cleavage planes Miller indices Energy landscape of a material Interfaces Energy landscape of both materials Note: Strong emphasis on Silicon (diamond) structure today Lecture 06: Finish Physical Structures: Planes and directions Low index cleavage planes Miller indices Energy landscape Interfaces Energy landscape of both materials Note: Strong emphasis on Silicon (diamond) structure today Planes and Directions: Motivation: To place a wafer order: O/R: Orientation Important planes => Cleavage planes Cleavage plane number of bonds to break. Minimum # = good cleavage Note: Wont see the cleavage planes in a Unit cell basic repeat unit well inside a crystal, not at surfaces Important planes = Cleavage planes http://www.geo.utexas.edu/courses/347k/redesign/Gem_Notes/Diamond/diam_anim.htm Cleavage plane number of bonds to break. Minimum # = good cleavage Note: If you drop and break a Silicon wafer, lots of sides will have this 35 o angle http://www.geo.utexas.edu/courses/347k/redesign/Gem_Notes/Diamond/diam_anim.htm Important planes = Cleavage planes Note: facets on a diamond ring: triangles at 35 o and flats Important planes => Cleavage planes...
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ECE474S09_Lecture06 - ECE 474: Principles of Electronic...

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