High‐Quality Two‐Dimensional Metal‐Organic Framework Nanofilms for Nonvolatile Memristive Switching

Abstract

Metal‐organic framework (MOFs) nanofilm offer new perspectives as active layers in memristor devices due to their large surface area, high chemical and thermal stability, permanent porosity, and tunable structure. Though various methods are reported for the preparation of MOF nanofilms, the development of new methods to improve the quality is still essential toward their broader and large‐scale application. Herein, Cu3(HHTP)2 (HHTP = 2, 3, 6, 7, 10, 11‐hexahydroxytriphenylene) nanofilms with a large lateral dimension, high homogeneity, and controllable thickness (from 45 to 130 nm) are prepared at the air–liquid interface and further applied in memory devices. The device exhibits a forming‐free, superior retention (1.2 × 104 s) performance with low power consumption and reliability. Kelvin probe force microscopy (KPFM) is applied to gain an insight into the switching mechanism. Herein, a facile and effective method for the preparation of MOF nanofilms is provided and the potential application of MOFs in electronic devices is further proved.

Cu3(HHTP)2 c‐MOF/ZnO Ultrafast Ultraviolet Photodetector for Wearable Optoelectronics

“…The strong absorption bands of both materials are in the UV region, which suggest that they both have wide band gaps. [37] In addition, the two characteristic absorption bands of Cu 3 (HHTP) 2 are attributed to 368 nm (π-π* transition) and 688 nm (ligand-to-metal charge transfer band). The Cu 3 (HHTP) 2 /ZnO device was also tested as shown in Figure 2c, and the strong absorption band of the device is around 365 nm, indicating its potential for UV detection.…”

Electrical bistability based on metal–organic frameworks

“…L. Liu and coworkers also attributed the RS characteristic charge of the Cu 3 (HHTP) 2 nanofilms to trapping/detrapping mechanism in 2021. 68…”

MOF‐Based Sustainable Memory Devices

“…[8] When a set voltage (V set ) is applied, this layer reacts structurally and, hence, electronically, changing its conductivity in a reversible way. [61] Surprisingly, MOFs can be successfully used as such active layers, [64][65][66][67][68][69][70][71][72][73][74][75][76] with no performance loss, and even sometimes outperforming the commercial counterparts (Table 2).…”

“…If the compound [118] mer-[Ru(2(phenylazo)pyridine) 3 ](PF 6 ) 2 demonstrates the highest performance, it is also the one using the metal with the highest supply risk (Ruthenium). The common compounds [65][66][67][68][69][70][71][72][73][74][75][76] like MIL-53, ZIF series, and HKUST are synthesized with abundant metals (Al, Cu, Zn, etc.) which reduces the supply risk (Figure 13g,h) and also the solicitation of the reserves, of the production as well as the CO 2 footprint since they are primary product, unlike Ru (secondary product of Platinum).…”