Towards High‐Performance Resistive Switching Behavior through Embedding a D‐A System into 2D Imine‐Linked Covalent Organic Frameworks

Abstract

Developing new materials for the fabrication of resistive random‐access memory is of great significance in this period of big data. Herein, we present a novel design strategy of embedding donor (D) and acceptor (A) fragments into imine‐linked frameworks to construct resistive switching covalent organic frameworks (COFs) for high‐performance memristors. Two D‐A‐type two‐dimensional COFs, COF‐BT‐TT and COF‐TT‐TVT, were designed and synthesized using a conventional solvothermal approach, and high‐quality thin films of these materials deposited on ITO substrate exhibited great potential as an active layer for memristors. Rewritable memristors based on 100 nm thick COF‐TT‐BT and COF‐TT‐TVT films showed a high ON/OFF current ratio (ca. 105 and 104) and low driving voltage (1.30 and 1.60 V). The cycle period and retention time for COF‐TT‐BT‐based rewritable devices were as high as 319 cycles and 3.3×104 s at a constant voltage of 0.1 V (160 cycles and 1.2×104 s for the COF‐TT‐TVT memristor).

Electrochemical Preparation of Porous Organic Polymer Films for High‐Performance Memristors

“…Memristor performances of these devices based on eCPFs are affected regularly by the electron transfer system within the films. The reduction of the band gaps propels the transfer of electron when being stimulated by voltage, which is directly reflected in the turn‐on voltage and on/off current ratio of related devices [51] . Notably, as an essential parameter for assessment of memristor, on/off current ratio of eCPF‐2 is enhanced over 1000 times as compared with that of eCPF‐0 attributed to the efficient electron transfer system constructed by introducing cyano units.…”

Rational design of a phenothiazine-based donor–acceptor covalent organic framework for enhanced photocatalytic oxidative coupling of amines and cyclization of thioamides

“…1 On account of their periodically ordered structures, high stability and porosity, COFs have emerged as a highly designable and tailorable material platform for various potential applications, 1,2 such as gas adsorption/separation, 3 chemical sensing, 4 energy storage 5 and heterogeneous catalysis. 6 In particular, two-dimensional COFs with π–π stacking between their layers can promote exciton migration and charge carrier transport through the aligned π columnar arrays, 7 and thus these materials have become attractive in photocatalytic applications. 8 However, their photocatalytic performances, to a certain degree, are still impeded by insufficient charge separation and transfer as well as fast charge carrier recombination.…”

Commissioning and First Results of the SSRF Phase-II Beamline Project

“…Surface Diffraction beamline has achieved an angle resolution better than 0.01 degree with high photon flux larger than 10 12 phs/s, which makes it possible to study the atomic-level surface/interface microstructures, in particular for that of solid-liquid, solid-solid and liquid-liquid in nano-science, condensed matter physics and soft matter systems [3,4] .…”

“…These beamlines have advanced performance and unique experimental methods, showing an important scientific application prospect. Some of them have produced good user outcomes, such as supporting users to publish NATURE articles, helping users get new coronavirus variant data and publishing related papers in CELL et al [1][2][3][4][5][6][7][8][9][10] .…”