Ultrathin Metal–Organic Framework Nanosheets as Nano‐Floating‐Gate for High Performance Transistor Memory Device

Abstract

Metal–organic framework (MOF) is an emerging important class of functional materials in the fields of information storage, wearable electronics and optoelectronic devices. The interaction of electrons or holes with MOFs is important for the systematic exploration of MOFtronics and to investigate the related structure–performance correlation. Herein, MOF flat nanosheets of copper tetrakis(4‐carboxyphenyl)porphyrin with sub‐10 nanometer scale in thickness are employed as the charge‐trapping layer in organic field‐effect floating‐gate transistor memory device fabricated by an air–liquid interfacial assembly and subsequent stamping operation. As charge trapping sites, MOF nanosheets with ultrathin nanoporous arrays significantly improve in comparison with the memory device using its counterpart ligand of tetrakis(4‐carboxyphenyl)porphyrin as the trapping elements. As compared to the reported widely applied nanofloating gate materials of gold nanoparticles, graphene, or macromolecular nanomaterials, a short pulse (≈20 ms) on the device gets a considerable memory window of ≈37.5 V at a programming voltage of ‐80 V, with a retention time longer than 104 s and good ON/OFF ratio of >103. Furthermore, the hybrid structure composed of metal and organic components endows it with electron and hole trapping capability. This work could push forward the fundamental research of organic–inorganic–hybrid electronics in future microelectronic research.

High-Performance Phototransistor Memory with an Ultrahigh Memory Ratio Conferred Using Hydrogen-Bonded Supramolecular Electrets

“…Presumably, it is due to their different aggregation and charge transfer patterns within the supramolecules that affect the emissive process of the supramolecules. 45,46,54,55 Figure 2f shows the emission spectrum of DNTT, and a strong emissive peak at approximately 470 nm was observed. The optical properties of the constituent materials in a phototransistor memory are understood to play a nontrivial role in the photoprogramming parameters and the device performance, and this relationship will be further investigated in the following section.…”

Switched Proton Conduction in Metal–Organic Frameworks

“…Therefore, proton field-effect transistors (H + -FETs), as a candidate device that can connect traditional electronics and biological systems, will still be a research hot spot in the future. 72 , 112 − 114 …”

“…Monitoring and controlling proton transfer processes by an artificial device is an ideal method in combination with biological systems. Therefore, proton field-effect transistors (H + -FETs), as a candidate device that can connect traditional electronics and biological systems, will still be a research hot spot in the future. ,− …”

A brief review on device operations and working mechanisms of organic transistor photomemories

“…[43][44][45] In the case of other photoactive charge storage material developments (such as rod-coil or rod-like liquid crystals, hybrid metal/metal-oxide nanoparticles/thin-films, metal-organic frameworks, photochromic blends/monolayers, biomass-derived electrets, and small-molecules based), and other unique morphologies/topologies of charge trapping interfaces, as well as device structures that are not covered in this section, could be found in the recently published reports and reviews. 22,23,[46][47][48][49][50][51][52][53][54][55][56][57][58] Below, the device structures and its memory characteristics to the device operations will be elaborated in detail.…”