Electrically conductive 2D covalent organic frameworks

Abstract

Covalent organic frameworks (COFs) offer a new platform for designing conductive organic polymers, in which conjugation could be directionally extended into two or three dimensions through reticular control. Benefiting from the periodic conjugated planar sheets, densely stacking structure, and porous nature, 2D COFs can realize efficient through-bond and through-space charge carrier migration. Two-dimensional covalent organic frameworks (2D COFs) offer unique charge carrier transport pathways within their higher-ordered skeletons, resulting in remarkable electronic properties. 2D COFs enable precise alignment of electron-rich and/or electron-deficient aromatic arenes in a predesignable manner, which brings new design principles to achieve high conductivity and mobility and opens a new class of tailor-made conducting polymers. Herein, we conclude the progress of conductive COFs in the following three categories: (i) basic design principles, (ii) methods for evaluating electronic properties, and (iii) synthetic approaches to conductive COFs. Two-dimensional covalent organic frameworks (2D COFs) offer unique charge carrier transport pathways within their higher-ordered skeletons, resulting in remarkable electronic properties. 2D COFs enable precise alignment of electron-rich and/or electron-deficient aromatic arenes in a predesignable manner, which brings new design principles to achieve high conductivity and mobility and opens a new class of tailor-made conducting polymers. Herein, we conclude the progress of conductive COFs in the following three categories: (i) basic design principles, (ii) methods for evaluating electronic properties, and (iii) synthetic approaches to conductive COFs. the set of electron orbitals in which electrons are loosely bound and free to move. the physical quantity that measures the ability to transmit charge carriers. the long-range regular ordering of atoms in a solid matrix. the highest-energy occupied molecular orbital containing electrons, and the HOMO energy is often considered analogous to the energy of valence band maximum in semiconductor physics. the lowest-energy unoccupied molecular orbital capable of receiving electrons, and the LUMO energy is often considered analogous to the energy of conduction band minimum in semiconductor physics. the physical quantity that measures the speed of charge carriers in a given direction under a given electric field. energy band formed by energy level splitting of the valence electron in which the electrons are too tightly bound to realize directional movement.