Can I read Organic Functionalization at the Si(001) Dimer Vacancy Defect – Structure, Bonding and Reactivity on EtoBox?

Organic Functionalization at the Si(001) Dimer Vacancy Defect – Structure, Bonding and Reactivity by Jan-Niclas Luy; Ralf Tonner is a scholarly article available to read on EtoBox.

What is Organic Functionalization at the Si(001) Dimer Vacancy Defect – Structure, Bonding and Reactivity about?

In this density functional theory study, the influence of the dimer vacancy on the reactivity of the Si(001) surface is investigated. To this end, electronic and structural properties of the defect are analyzed. Band structure calculations reveal a higher-lying valence band which would suggest increased reactivity. However, the opposite is found when organic molecules for interface formation (acetylene, ethylene and cyclooctyne) are adsorbed at the defect. Significant reaction barriers have to be overcome in order to form bonds with defect atoms, while adsorption on the pristine surface is mostly direct. This suggests the presence of a, rather weak, Si-Si bond across the defect which must be dissociated before organic adsorbates can react. A rich adsorption and reaction network is found in addition to the structures known from the pristine surface. All three investigated adsorbates show different bonding characteristics. For acetylene and ethylene, the preferred thermodynamic sink is the insertion into the defect, with the latter molecule even dissociating. Bulky cyclooctyne on the other hand avoids reaction with the defect due to steric demands imposed by the small defect cavity.

Author

Jan-Niclas Luy; Ralf Tonner

Publisher

American Chemical Society (ACS)

Published

2021

Language

EN