EMS162_2010_SurfaceReconstruction_SPM

EMS162_2010_SurfaceReconstruction_SPM - Atomic Arrangements...

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1 3/2/2010 EMS 162 - Winter 2010 1 Yayoi Takamura Atomic Arrangements on (00 l ) Planes http://www.ibiblio.org/e-notes/Cryst/Cryst.htm Si a a Kasap 3/2/2010 EMS 162 - Winter 2010 2 Yayoi Takamura Atomic Arrangements on ( hh 0) Planes Si a Sqrt(a) Kasap
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2 3/2/2010 EMS 162 - Winter 2010 3 Yayoi Takamura Sqrt(a) S q r t ( a ) Atomic Arrangements on ( hhh ) Planes Si Kasap 3/2/2010 EMS 162 - Winter 2010 4 Yayoi Takamura Surface Reconstruction • Surface: – Cleave a crystal along a certain plane – Break the 3D symmetry – Break bonds leaving dangling bonds • Reconstruction – Rearrangement of surface atoms to satisfy dangling bonds – Notation: NxN where N relates to the size of reconstructed surface unit cell relative to 3D unit cell – Different for different crystal structures and different crystal orientations
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3 3/2/2010 EMS 162 - Winter 2010 5 Yayoi Takamura 2x1 reconstruction of (001) Si surface • The Si atoms of the topmost layer form a covalent bond with an adjacent surface atom are thus drawn
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EMS162_2010_SurfaceReconstruction_SPM - Atomic Arrangements...

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