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Surface structural phase transition induced by the formation of metal–organic networks on the Si(111)- -In surface

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Abstract

We studied the adsorption of 7,7,8,8-tetracyanoquinodimethane (TCNQ) on the Si(111)- Image ID:c9nr07074e-t3.gif-In surface, a known surface superconductor. Scanning tunneling microscopy shows the development of a surface-confined metal–organic network (SMON) where TCNQ molecules coordinate with indium atoms from the underlying Image ID:c9nr07074e-t4.gif reconstruction. The formation of the SMON causes a surface structural phase transition from the Image ID:c9nr07074e-t5.gif reconstruction to a previously unknown 5 × 5 reconstruction of the Si(111)–In surface. Scanning tunneling spectroscopy measurements indicate that the 5 × 5 reconstruction has a stronger insulating character than the Image ID:c9nr07074e-t6.gif reconstruction. Density-functional-theory calculations are used to evaluate the atomic arrangement and stability of the 5 × 5 and Image ID:c9nr07074e-t7.gif reconstructions as a function of In coverage, and suggest that the structural phase transition is driven by a slight reduction of the In coverage, caused by the incorporation of indium atoms into the SMON.

Graphical abstract: Surface structural phase transition induced by the formation of metal–organic networks on the Si(111)--In surface

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Publication details

The article was received on 16 Aug 2019, accepted on 24 Oct 2019 and first published on 06 Nov 2019


Article type: Paper
DOI: 10.1039/C9NR07074E
Nanoscale, 2019, Advance Article

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    Surface structural phase transition induced by the formation of metal–organic networks on the Si(111)-Image ID:c9nr07074e-t1.gif-In surface

    T. Suzuki, J. Lawrence, J. M. Morbec, P. Kratzer and G. Costantini, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR07074E

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