Charge carrier transport on molecular wire controlled by dipolar species: towards light-driven molecular switch

Charge carrier transport on molecular wire (conjugated polymer chain) is limited by polaron formation and by Coulomb interactions between a charge localized on a chain and another charge moving on the same or a neighboring chain. The ‘Coulomb limitation’ results from a feature characteristic of one-...

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Bibliographic Details
Published in:Thin solid films 2003-08, Vol.438, p.268-278
Main Authors: Nešpůrek, Stanislav, Toman, Petr, Sworakowski, Juliusz
Format: Article
Language:English
Subjects:
Conductivity
Molecular electronics
Polymers
Polysilylene
Quantum effects
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Summary:Charge carrier transport on molecular wire (conjugated polymer chain) is limited by polaron formation and by Coulomb interactions between a charge localized on a chain and another charge moving on the same or a neighboring chain. The ‘Coulomb limitation’ results from a feature characteristic of one-dimensional systems in which carriers cannot be scattered. Polar side groups attached to the molecular wire locally modify the ionization energy of the polymer segments and energies of electrostatic interactions of charge carriers on the wire and the dipoles. These changes result in the formation of a potential well structure and in the creation of local states for charge carriers. If the side groups are photochromic species changing their dipole moments upon illumination, then a light-driven molecular switch can be constructed.
ISSN:0040-6090
1879-2731
DOI:10.1016/S0040-6090(03)00799-5