A Photoconductive Covalent Organic Framework: Self‐Condensed Arene Cubes Composed of Eclipsed 2D Polypyrene Sheets for Photocurrent Generation

On again, off again: A pyrene-based covalent organic framework (see structure: blue pyrene, white B, red O) facilitates exciton migration and carrier transportation, harvests visible-light photons, and responds quickly to irradiation with light to enable the generation of a significant photocurrent. The framework is capable of repetitive photocurrent switching with a large on–off ratio.