Defects Handout - University of California, Berkeley EE230...

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- 9 - University of California, Berkeley EE230 - Solid State Electronics Prof. J. Bokor Crystal Defects (scan Kittel Ch. 18, 20 look at figs.) • Real crystals are never perfect • Semiconducting properties of most interest are predominantly caused by crystal defects Main types of defects: 1. Point defects (single atoms, vacancies) 2. Line defects (dislocations) 3. Plane defects (surfaces, grain boundaries) 4. Volume defects (small inclusions, precipitates, defect clusters) Point defects • Native defects: vacancies (missing atom) interstitials (extra host atom, not on a lattice site) anti-site defect (e.g. in GaAs, Ga on an As site, or vice-versa) • Impurities: could be substitutional or interstitial The lattice surrounding a defect usually relaxes.
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- 10 - University of California, Berkeley EE230 - Solid State Electronics Prof. J. Bokor From thermodynamics: Schottky: for diatomic lattice: charge neutrality requires equal #s of anion, cation vacancies Frenkel (similar to diatomic): Dislocations 2 types: • edge dislocations
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This note was uploaded on 08/01/2008 for the course EE 230 taught by Professor Bokor during the Spring '08 term at University of California, Berkeley.

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Defects Handout - University of California, Berkeley EE230...

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