We have used ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS respectively) to study the electronic structure of the electrically conducting polymer polythiophene (PT) prepared electrochemically. The UPS and XPS valence band spectra of electrochemically reduced, insulating PT (i.e., PT°) are compared with corresponding spectra of thiophene in the gas phase and in the condensed phase, with the spectra of pure radiation polymerized PT°, and with the results of quantum chemical calculations based upon the Valence Effective Hamiltonian (VEH) and CNDO/S3 models. Excellent agreement is obtained between theory and experiment. We have also noticed some unusual effects in the XPS valence spectrum of PT°, and in the XPS core level spectra of doped PT (i.e., Pt+) due to exposure of the samples to air.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Materials Chemistry
- Polymers and Plastics