Donor-acceptor Dyads for Molecular Rectifying Devices
Author | : Mykola Kondratenko |
Publisher | : |
Total Pages | : |
Release | : 2011 |
Genre | : |
ISBN | : |
Download Donor-acceptor Dyads for Molecular Rectifying Devices Book in PDF, Epub and Kindle
The interest in molecular electronics began in the 1970s with the work of Aviram and Ratner, who proposed that a donor-acceptor dyad, specifically TTF-sigma-TCNQ molecule (TTF-tetrathiafulvalene, sigma-nonconjugated bridge and TCNQ- tetracyanoquinodimethane), can resemble the electric properties of a p-n junction, acting as a unimolecular diode. The reason of such behaviour lies in asymmetrically distributed electronic levels, and very low HOMO-LUMO gap (0.3 eV) that was imposed for the model molecule. Up to date, numerous donor-acceptor dyads were investigated as candidates for molecular rectifiers, which included some D-sigma-A dyads with weak or moderate donor and acceptor moieties, numerous D-sigma-A and also molecules without obvious asymmetry in the electronic structure. However, neither the original TTF-sigma-TCNQ molecule nor any other molecule with similar HOMO-LUMO gap have been studied in molecular electronics applications ...