Abstract
We theoretically investigate the electric rectification in an organic
two terminal push-pull molecular device using a combination of ab initio
techniques. Our main finding is that the electric rectification is
extremely sensitive to the length of the chain, undergoing a complete
switching after a specific chain length. This unique process occurs for
betaine-like donor-g bridge-acceptor systems and is directly associated
with a conjugated bridge in the presence of an external electric field.
The conjugated bridge between the donor and acceptor groups is composed of oligoethylene with sizes ranging from 0 to 10 C=C units. The
appearance of electric rectification occurs when the bridge size is
equal to 5 units and is complete for those larger than 6 units (i.e.,
full inversion). This new electronic effect is advantageous for the
design of large hybrid organic/inorganic circuits with an increased
majority carrier flow that is necessary for the emerging needs of
nanotechnology.
Users
Please
log in to take part in the discussion (add own reviews or comments).