Atomic dipole moment distribution on a hydrogen-adsorbed Si(111)-(7 × 7) surface observed by noncontact scanning nonlinear dielectric microscopy

Daisuke Mizuno, Kohei Yamasue, Yasuo Cho

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Noncontact scanning nonlinear dielectric microscopy (NC-SNDM) can atomically resolve the polarization distribution on material surfaces. We observed a hydrogen-adsorbed Si(111)-(7 × 7) surface using NC-SNDM and found that hydrogen-adsorbed Si adatoms had lower dipole moments than bare Si adatoms. We discuss the charge distribution around a hydrogen-adsorbed Si adatom in terms of its geometry and the electronegativities of hydrogen and silicon. Our model suggests that the charge distribution around a hydrogen-adsorbed adatom is nearly symmetric and it qualitatively explains the experimental results. We thus conclude that the hydrogen-adsorbed Si adatoms are both electrically and chemically passivated.

Original languageEnglish
Article number101601
JournalApplied Physics Letters
Volume103
Issue number10
DOIs
Publication statusPublished - 2013 Sep 2

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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