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2D bands and electron-phonon interactions in polyacene plastic transistors.
J Sinova1, J Schliemann, A S Núñez
1Department of Physics, University of Texas, Austin, Texas 78712-1081, USA.
Physical Review Letters
|December 12, 2001
Summary
We developed a model for polyacene transistors, explaining how molecular vibrations cause superconductivity. This model predicts superconductivity onset at specific carrier densities, matching experimental observations.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Organic Electronics
Background:
- Polyacene field-effect transistors exhibit unique electronic properties.
- Understanding electron-phonon interactions is crucial for organic electronics.
- Recent experiments show superconductivity in these systems.
Purpose of the Study:
- To develop a theoretical model for polyacene transistor energy bands.
- To investigate the coupling between electronic bands and lattice vibrations.
- To explain the observed superconductivity in polyacene-based devices.
Main Methods:
- A simple tight-binding model was employed.
- A generalized Su-Schrieffer-Heeger model was introduced.
- Calculations of electron-phonon interaction spectral density, alpha(2)F(omega), were performed.
Main Results:
- The strongest electron-phonon interactions arise from the dependence of intermolecule hopping on molecular motion.
- The model is parameter-free after specifying band mass.
- The model explains the onset of superconductivity at 2D carrier densities around 10(14) cm(-2).
Conclusions:
- The developed model successfully describes the electronic and vibrational properties of polyacene transistors.
- The findings provide a theoretical basis for understanding superconductivity in organic molecular crystals.
- The model offers a predictive tool for designing future organic electronic devices with enhanced properties.