IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Organic Films and Devices Thursday Sessions
       Session OF+EL+TF-ThA

Paper OF+EL+TF-ThA6
Characterization of Organic/organic' Heterojunctions using UV and X-ray Photoemission Spectroscopies and Luminescence Quenching

Thursday, November 1, 2001, 3:40 pm, Room 131

Session: Electronic Properties of Organic Thin Films
Presenter: D. Alloway, University of Arizona
Authors: D. Alloway, University of Arizona
D. Schlettwein, University of Bremen and University of Oldenburg, Germany
N.R. Armstrong, University of Arizona
Correspondent: Click to Email
Heterojunctions based on ultrathin films of perylenedicarboxylicbisimide (PTCDI) dyes, and various phthalocyanine (Pc) overlayers, have been explored using combinations of UPS and XPS, to define the band-edge offset of these systems, and quenching of the luminescence response of the PTCDI layers as a function of coverage of the Pc layer. Depending upon initial PTCDI coverage, the quenching of its luminescence response is extremely efficient using less than 1-2 monolayer coverages of Pc, and can be seen to be due to a combination of energy transfer, and exciton dissociation events. UPS measurements suggest small interface dipoles are formed for some of the PTCDI/Pc heterojunctions, especially those which are based on perfluorinated Pcs, which have high electron affinities. These interface dipoles have the potential to accelerate exciton dissociation, and may be of importance in the application of these systems to organic photovoltaic applications.