AVS 50th International Symposium
    Contacts to Organic Materials Topical Conference Monday Sessions
       Session OM-MoA

Paper OM-MoA6
A Combined Photoemission Spectroscopy and Scanning Probe Microscopy Study of Organic Charge Injection Layer / Metal Interfaces

Monday, November 3, 2003, 3:40 pm, Room 318/319

Session: Contacts to Molecules and Molecular Films (II)
Presenter: A.J. Makinen, Naval Research Laboratory
Authors: A.J. Makinen, Naval Research Laboratory
J.P. Long, Naval Research Laboratory
N.J. Watkins, Naval Research Laboratory
Z.H. Kafafi, Naval Research Laboratory
Correspondent: Click to Email
The electronic structure of organic/metal interfaces was investigated using photoemission spectroscopy in combination with scanning probe microscopy. Organic films of copperphthalocyanine (CuPc) and @alpha@-sexithiophene (6T) were vacuum-deposited onto a single-crystal Au(111) substrate step-by-step, and ultraviolet and x-ray photoemission spectroscopies (UPS and XPS) were performed on the sample, together with scanning probe microscopy (SPM), at each step. By correlating different organic film structures revealed by SPM measurements with the corresponding electron energy spectra measured with UPS and XPS, we have been able to gain insights into how the frontier orbital character and position evolve with the organic film growth on the Au substrate. Since CuPc/Au and 6T/Au interfaces serve as model systems for similar structures responsible for charge injection and transport in many organic electronic devices, such as organic light-emitting diodes and photovoltaics, the results of this investigation will be useful for the characterization of such systems.