Record number :
1000128
Title of article :
Si-substitutional defects on the a-Sn/Si(1 1 1)-( ffiffiffi 3 p ffiffiffi 3 p ) surface
Author/Authors :
Wojciech Kaminski، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
6
From page :
286
To page :
291
Abstract :
We present a theoretical analysis of the atomic and electronic structure of Si-substitutional defects on the a-Sn/Si(1 1 1)- ( ffiffiffi 3 p ffiffiffi 3 p ) surface. We use a first-principles DFT local-orbital method and analyze Si-defects on a large Sn/Si(1 1 1) surface unit-cell, corresponding to a defect concentration as low as 3.7%. We also calculate the theoretical STM images, and compare with the experimental results.We find that a single Si-defect induces an upward displacement of its six nearest Sn-adatoms that shows up in filled state STM images as a bright ring of adatoms around the defect.We also analyze the atomic structure and STM images associated with three nearby Si-defects. These results are compared with those found for the Sn/Ge(1 1 1) surface. We conclude that the atomic distortion induced by Si (Ge) substitutional defects is very local, the differences found for these two surfaces being basically due to their different ground state geometries. # 2004 Elsevier B.V. All rights reserved.
Journal title :
Applied Surface Science
Journal title :
Applied Surface Science
Serial Year :
2004
Link To Document :
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