AVS 62nd International Symposium & Exhibition
    Surface Science Monday Sessions
       Session SS-MoA

Paper SS-MoA1
ZnTPP, PTCDA, TCNQ, and TTF on TiO2(110): Molecule-Oxide Interaction and Electronic Energy Level Alignment

Monday, October 19, 2015, 2:20 pm, Room 113

Session: Organics and Ionic Liquids: Surfaces, Layers, Interfaces and Chirality
Presenter: Charles Ruggieri, Rutgers, the State University of New Jersey
Authors: C. Ruggieri, Rutgers, the State University of New Jersey
S. Rangan, Rutgers, the State University of New Jersey
R.A. Bartynski, Rutgers, the State University of New Jersey
J.I. Martinez, Institute of Materials Science of Madrid, Spain
F. Flores, Autonomous University of Madrid, Spain
J. Ortega, Autonomous University of Madrid, Spain
Correspondent: Click to Email
The injection of charge between transition metal oxides and organic materials depends crucially on the interface barrier that is determined by the organic electronegativity, the possible space charge layer formed in the oxide, and the chemical interaction between the oxide and the organic. We investigate the interfaces of TiO2(110) and four organic molecules, ZnTPP, PTCDA, TCNQ, and TTF, representing a broad range of electronegativities, and the electronic energy level alignment for each interface, using a combination of direct and inverse photoemission spectroscopies and theoretical modelling. In particular, we analyze contributions to the electronic energy level alignment from oxide-molecule chemical hybridization, induced electrostatic dipoles due to molecular distortion, and charge transfer, and the relative importance of these phenomena to each case. In this way, we provide a detailed description of the wide range of interactions influencing the final electronic energy level alignment for weakly and strongly interacting organic on TiO2 (110).