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+TF-ThP

Paper OF+TF-ThP13
XPS Studies of Conducting Polymer Hybrid Films Incorporated with Dye Molecules

Thursday, November 1, 2001, 5:30 pm, Room 134/135

Session: Aspects of Organic Films Poster Session
Presenter: H. Kato, Kanto Gakuin University, Japan
Authors: H. Kato, Kanto Gakuin University, Japan
S. Takemura, Kanto Gakuin University, Japan
N. Aragaki, Kanto Gakuin University, Japan
Correspondent: Click to Email
Conducting polymer polythiophene (PT) films incorporated with dye molecule safranine T (ST) prepared by electrochemical doping and diffuse injection methods were investigated by XPS. Polymeric structure, charge transfer and interaction between dye molecul e and PT backbone in the hybrid films were closely investigated by analyzing the core-level energies and spectral profiles of the atomic components. XPS core-level analysis of N 1s showed that dye molecules were injected into polymer matrix in hybrid fil ms. In the case of PT film incorporated with ST, drastic change of C 1s, S 2p, and Cl 2p core-level spectra between electrochemically as-grown and reduced films was observed. In the case of electrochemically reduced sample core-level energies of C1s and S 2p were shifted to the lower energy side indicating the creation of n-type polymer chain while in the case of electrochemically as-grown sample the polymer chain is p-type. The splitting of S 2p reflects the strong interaction betwen ST molecule and PT backbone. The C 1s core-level spectrum varied with the degree of electrochemical reduction. The C 1s spectrum is basically composed of two different Gaussian components. In the highly reduced case lower energy component grows while in the low reduced case higher energy component becomes dominant. The spectral change reflects the existence of different charged states in polymer backbone.