Recent advances in functional electronic devices enabled by two-dimensional covalent organic framework films

Abstract

Covalent organic frameworks (COFs) are an emerging class of crystalline organic polymers characterized by highly ordered structures and permanent porosity. Depending on the symmetry and connectivity of their building blocks, COFs can adopt either two-dimensional (2D) or three-dimensional (3D) architectures. Among these, 2D COFs have attracted significant attention due to their remarkable properties, including extended in-plane π-conjugation and topologically ordered columnar π-arrays. These attributes, combined with high crystallinity, large surface area, and tunable porosity, make 2D COFs highly promising candidates for functional electronic devices. This review provides a comprehensive overview of recent advancements in the synthesis of 2D COF thin films and their optical and electrical functionalities, with a focus on their integration into electronic applications. Challenges and future perspectives are discussed to guide further developments in the synthesis and functionalization of 2D COF thin films for next-generation electronic technologies.