Preserving the 7 × 7 surface reconstruction of clean Si(111) by graphene adsorption

Justin C. Koepke, Joshua D. Wood, Cedric M. Horvath, Joseph W. Lyding, Salvador Barraza-Lopez

Research output: Contribution to journalArticle

Abstract

We employ room-temperature ultrahigh vacuum scanning tunneling microscopy and ab-initio calculations to study graphene flakes that were adsorbed onto the Si(111)-7 × 7 surface. The characteristic 7 × 7 reconstruction of this semiconductor substrate can be resolved through graphene at all scanning biases, thus indicating that the atomistic configuration of the semiconducting substrate is not altered upon graphene adsorption. Large-scale ab-initio calculations confirm these experimental observations and point to a lack of chemical bonding among interfacial graphene and silicon atoms. Our work provides insight into atomic-scale chemistry between graphene and highly reactive surfaces, directing future passivation and chemical interaction work in graphene-based heterostructures.

Original languageEnglish (US)
Article number071603
JournalApplied Physics Letters
Volume107
Issue number7
DOIs
StatePublished - Aug 17 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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