AVS 51st International Symposium
    Surface Science Wednesday Sessions
       Session SS+OF-WeA

Paper SS+OF-WeA8
Work Function and Charge Distribution XPS Study of Molecular Layers Self-Assembled on Gold

Wednesday, November 17, 2004, 4:20 pm, Room 213B

Session: Contacts to Molecules and Molecular Films
Presenter: S. Ray, The Weizmann Institute of Science, Israel
Authors: H. Cohen, The Weizmann Institute of Science, Israel
S. Ray, The Weizmann Institute of Science, Israel
R. Naaman, The Weizmann Institute of Science, Israel
Correspondent: Click to Email
Substrate-overlayer charge transfer frequently imposes considerable changes on the properties of self-assembled (SA) monolayers. The study of space charge distribution across molecular layers is targeted here, using XPS in a slightly modified setup, capable of in-situ work-function evaluation. Fine differentiation between chemical and electrical information across dipolar layers is demonstrated. Intra-molecular charge transfer is found to take place in part of the systems, giving rise to a directional flip of the dipole moment on the nanometer scale.