EEE 537 L3 Defects

EEE 537 L3 Defects - Defects Anything that breaks the...

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Defects • Anything that breaks the original symmetry • Unavoidable oint defects volve isolated atoms in localized • Affect electrical and optical properties (how?) Point defects involve isolated atoms in localized regions of a host crystal. Line defects involve rows of atoms and typical examples of line defects are dislocations . Defect complexes compose of a small number of point defects and line defects. EEE537_Fall 10 C. Z. Ning, ASU ECEE 1
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Point Defects (1) Vacancies: they are created by a missing atom ( V A ) Interstitial: an atom occupying an interstitial site ( I A ) ubstitutional: atom replacing a host atom ( Substitutional: an atom replacing a host atom ( C A ) Anti-site: a special kind of substitutional defect in which a host atom B occupies the site of another host atom A Frenkel defect pair: a complex V A - I A formed by an atom A displaced from a lattice site to nearby interstitial te site EEE537_Fall 10 C. Z. Ning, ASU ECEE 2
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Point Defects (2) renkel defect pair Frenkel defect pair EEE537_Fall 10 C. Z. Ning, ASU ECEE 3
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EEE 537 L3 Defects - Defects Anything that breaks the...

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