AVS 53rd International Symposium
    Electronic Materials and Processing Friday Sessions
       Session EM-FrM

Paper EM-FrM7
Energy-Level Alignment at Thiol/Metal Interfaces: A Model "Molecular Wire" Chemisorbed on Ag, Cu, Au, and Pt.

Friday, November 17, 2006, 10:00 am, Room 2001

Session: Molecular Electronics
Presenter: C.D. Zangmeister, National Institute of Standards and Technology
Authors: C.D. Zangmeister, National Institute of Standards and Technology
R.D. van Zee, National Institute of Standards and Technology
C.A. Ventrice, University of New Orleans
Correspondent: Click to Email
Photoemission spectra have been used to determine the energy-level alignment for self-assembled monolayers of the "molecular wire" 4,4'-bis-(phenylethynyl)benzenethiol self-assembled on Ag, Cu, Au, and Pt. We measured a shift in the hole-transport barrier with metal work function due to changes in the interfacial electrostatics. The hole-transport barrier as a function of metal work function is near the common vacuum limit (S@subB@ = 0.8). The shift of the hole-transport barrier is analyzed as an interfacial dipole and decomposed with a three term model. The current through a model metal/molecule/metal junction is calculated using the measured values of the hole-transport barrier, and trends are found to be consistent with previously published results.