Non-local atomic manipulation on semiconductor surfaces in the STM

The case of chlorobenzene on Si(111)-7×7

Tianluo Pan, Peter A. Sloan, Richard E. Palmer

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Control over individual atoms with the scanning tunnelling microscope (STM) holds the tantalising prospect of atomic-scale construction, but is limited by its "one atom at a time" serial nature. "Remote control" through non-local STM manipulation-as we have demonstrated in the case of chlorobenzene on Si(111)-7×7-offers a new avenue for future "bottom-up" nanofabrication, since hundreds of chemical reactions may be carried out in parallel. Thus a good understanding of the non-local manipulation process, as provided by recent experiments, is important. Comparison of scanning tunnelling spectroscopy (STS) measurements of the bare Si(111)-7×7 surface and chemisorbed chlorobenzene molecules with the voltage dependence of the non-local STM-induced desorption of chlorobenzene proves particularly instructive. For example, the chlorobenzene LUMO appears at +0.9 V with respect to the Fermi level, whereas non-local manipulation thresholds are found at +2.1 V and +2.7 V. This difference supports a picture in which the voltage thresholds for non-local electron-induced desorption depend principally on the energies of the electronic states of the surface. Furthermore, the demonstration that the non-local process is largely insensitive to surface steps up to five layers in height suggests that either the electron transport in this process is subsurface in character or surface charge transport is responsible but is in some way unaffected by the steps.
Original languageEnglish
Pages (from-to)841-847
JournalChemical Record
Volume14
Issue number5
Early online date6 Aug 2014
DOIs
Publication statusPublished - Oct 2014

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Semiconductors
Microscopes
Semiconductor materials
Scanning
Desorption
Atoms
Electronic states
Surface charge
Remote control
Electron Transport
Fermi level
Threshold voltage
Nanotechnology
Charge transfer
Chemical reactions
Spectrum Analysis
Demonstrations
Spectroscopy
Electrons
Molecules

Cite this

Non-local atomic manipulation on semiconductor surfaces in the STM : The case of chlorobenzene on Si(111)-7×7. / Pan, Tianluo; Sloan, Peter A.; Palmer, Richard E.

In: Chemical Record, Vol. 14, No. 5, 10.2014, p. 841-847.

Research output: Contribution to journalArticle

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