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-π
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 …

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 betainelike donor-
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 …