Electron-Phonon Coupling Spectrum in Photodoped Pentacene Crystals
Abstract
The coupling between conduction charges and the vibrational modes of the molecular lattice plays a defining role in the transport characteristics of organic semiconductors. Using electron tunneling spectroscopy, we obtain the electron-optical phonon coupling spectrum in photodoped pentacene crystals at energies < 30 meV. The symmetry of the coupling resonances with respect to bias sign strongly suggests polaron formation. Comparison of the tunneling spectrum to infrared absorption data on the optical phonon density-of-states yields the energy dependence of the electron-phonon scattering matrix element. The integrated spectral weight of the electron-phonon coupling shows that superconductivity in pentacene is likely of electron-phonon origin.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2001
- Bibcode:
- 2001APS..MAR.Q9002L