Ultra-Fast Self-Powered Heterojunction Blue-light Photodetector Based on Boronate-ester-linked Covalent Organic Framework-5.

Abstract

Covalent organic framework materials have recently garnered significant interest from the scientific community due to their fascinating properties that include highly ordered porosity, structural versatility, high chemical and thermal stabilities, and facile surface modification. Herein, for the first time, we present the design and fabrication of a self-powered blue-light photodetector based on boronate-ester-linked 2D covalent organic framework (COF-5) film, synthesized using hexahydroxytriphenylene and 1,4-phenylenediboronic acid organic linkers. Specifically, we have developed a COF-5/n-Si photodetector that exhibits an ultra-short rise response time of 41μs and a decay response time of 222 μs, an ultra-high detectivity of 1.4 × 1012 Jones under 0 V bias. Our work surpasses the current state-of-the-art, by integrating rapid response times, high detectivity, and the distinctive benefit of self-powering, setting it apart from existing 2D-material based photodetectors.