A comprehensive surface science study of TCNQ on Ag(111)
P. Blowey1,3, L.A. Rochford2, D.A. Duncan3, D. Warr2, T-L. Lee3, G. Costantini2, D.P. Woodruff 1.
1Department
of Physics, University of Warwick, Coventry CV4 7AL, UK
2Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
3Diamond Light Source, Didcot, OX11 0QX, UK
TCNQ is a strong electron acceptor molecule that has attracted great interest for
applications in organic electronics due to its ability to induce charge transfer processes
when combined with a wide range of materials. Here, we provide a quantitative structural
analysis of the adsorption of TCNQ on the Ag(111) surface. We use the complementary
techniques of scanning tunnelling microscopy (STM) and low energy electron diffraction
(LEED) to determine the molecular lateral order, combined with normal incidence standing
wavefield absorption (NIXSW) to determine the TCNQ heights above the surface, attaining
a complete three-dimensional structure of the metal-organic interface.