AVS 52nd International Symposium
    Electronic Materials and Processing Wednesday Sessions
       Session EM+SS-WeM

Paper EM+SS-WeM8
Orbital Alignment and Chemical Interaction at Macro-Molecular Contacts

Wednesday, November 2, 2005, 10:40 am, Room 309

Session: Contacts to Organic and Molecular Devices
Presenter: R. Schlaf, University of South Florida
Authors: M.M. Beerbom, University of South Florida
B. Lagel, University of South Florida
J.P. Magulick, University of South Florida
A.J. Cascio, University of South Florida
R. Schlaf, University of South Florida
Correspondent: Click to Email
Our experiments aim at the determination of the chemical and electronic structure of interfaces between macro-molecules and inorganic materials to determine charge injection barriers across the interfaces, the electronic structure of the highest occupied molecular orbitals (HOMO), and the chemical interaction between the materials in contact. Photoemission spectroscopy (PES) was used in combination with multi-step in-situ deposition of macro-molecular materials on inorganic substrates. PES characterization between deposition steps yields a sequence of spectra allowing the determination of the orbital line-up. Multi-step deposition was achieved using either a unique electrospray thin film deposition system, or a glove-box based deposition procedure. This allowed the fabrication of pure and non-contaminated interfaces suitable for PES measurements. Results from a series of experiments on poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV),@footnote 1@ ribonucleic acid (RNA@footnote 2@) and L-cysteine (amino acid)@footnote 3@ interfaces will be presented. The electronic and chemical structure of these interfaces will be discussed as well as the measurement technique. @FootnoteText@ @footnote 1@N. Dam, M.M. Beerbom, J.C. Braunagel and R. Schlaf: "Photoelectron Spectroscopic Investigation of In-Vacuum Prepared Luminescent Polymer Thin Films Directly From Solution", J. Appl. Phys. 97(pp.024909 (2005).@footnote 2@N. Dam, B.V. Doran, J.C. Braunagel and R. Schlaf: "Charge injection barriers at a ribonucleic acid/inorganic material contact determined by photoemission spectroscopy", J. Phys. Chem. 109(2), pp.748-756 (2005).@footnote 3@M.M. Beerbom, R. Gargagliano and R. Schlaf: "Determination of the Electronic Structure of Self-Assembled L-cysteine/Au Interfaces Using Photoemission Spectroscopy", Langmuir Articles ASAP), (2005).