Molecular conductors, also known as conductive molecular crystals, include semiconductors, conductors and superconductors. Molecular conductor is a new crystalline material structure form different from ionic crystals, covalent crystals, metal crystals and molecular crystals. Its structural feature is that conductive components (planar conjugated molecules in the form of free radicals) are packed tightly and orderly in the crystal, and π electron clouds between molecules overlap to form energy bands. Unlike ordinary molecular crystals, molecular conductors have intermolecular interactions far greater than van der Waals forces, and are widely used in molecular electronic devices, bioelectrodes, sensor materials and other fields. At present, such materials are mainly complex molecular conductors, and the charge carriers are provided by chemical doping, with abundant oxidation states and high conductivity. It is worth noting that the crystal structure of a molecular conductor has a great influence on its energy band structure and conductivity. The homogenization of molecules and the spacing of conductive components are structural factors that help increase the conductivity of molecular conductors.
Figure 1. The chemical structure of some common molecular conductors
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