Hybrid molecular electronic devices based onmodified deoxyguanosines

Abstract

A new type of organic semiconductor, based on self-assembledmodified DNA nucleosides (deoxyguanosine lipophilicderivative), is employed to fabricate hybrid molecular devices.Two different modifications of the guanosine are synthesized inorder to change the oxidation potential of the active molecularsystem. The influence of the solvent on the self-assemblyprocess and on the carrier transport is investigated by atomicforce microscopy and electrical measurements, respectively. Ourresults demonstrate that upon appropriate engineering of themolecule and choice of the solvent, self-organization ofmolecules in ordered structures is achieved, resulting in highconductivity and electronic rectification in solid-state, planarmolecular devices. The transport properties depend strongly onthe molecular structure and on the arrangement of the moleculesinto the hybrid devices, thus opening the route to moleculartransport engineering in hybrid molecular electronics.