2D metal-organic frameworks for ultraflexible electrochemical transistors with high transconductance and fast response speeds

Abstract

Electrochemical transistors (ECTs) have shown broad applications in bioelectronics and neuromorphic devices due to their high transconductance, low working voltage, and versatile device design. To further improve the device performance, semiconductor materials with both high carrier mobilities and large capacitances in electrolytes are needed. Here, we demonstrate ECTs based on highly oriented two-dimensional conjugated metal-organic frameworks (2D c-MOFs). The ion-conductive vertical nanopores formed within the 2D c-MOFs films lead to the most convenient ion transfer in the bulk and high volumetric capacitance, endowing the devices with fast speeds and ultrahigh transconductance. Ultraflexible device arrays are successfully used for wearable on-skin recording of electrocardiogram (ECG) signals along different directions, which can provide various waveforms comparable with those of multilead ECG measurement systems for monitoring heart conditions. These results indicate that 2D c-MOFs are excellent semiconductor materials for high-performance ECTs with promising applications in flexible and wearable electronics.

Stable organic electrochemical neurons based on p-type and n-type ladder polymers

“…Considered altogether, these inverter characteristics are among the best reported for sub-1 V complementary inverters. 46,49,52,63,65–69…”

“…Considered altogether, these inverter characteristics are among the best reported for sub-1 V complementary inverters. 46,49,52,63,[65][66][67][68][69] Finally, we used the complementary electrochemical inverters described above to develop LIF type OECNs based on a modified version of the Axon-Hillock circuit (Fig. 6(a)).…”

Porous crystalline materials for memories and neuromorphic computing systems

“…307 Subsequently, the device architecture of the Cu 3 (HHTP) 2 based EG-FET was optimized through photolithography, resulting in a smaller channel length (30 μm) and thickness (50 nm) and lateral gated device geometry. 308 The obtained device showed ambipolar charge transfer behavior, which may be dominated by the ion doping process and thin channel thickness. Under the large positive (negative) V GS bias, the cations (anions) can permeate into the porous channels, resulting in the n- (p-) type doping, thereby the ambipolar behavior.…”

“…The ambipolar behavior, high transconductance, and fast response speed promote the promising applications of flexible all-MOF inverter with static gain of 4 at low operation voltage (0.3 V), and wearable multidirectional electrocardiogram (ECG) mapping. 308…”

Hybridization Chain Reaction-Enhanced Biocatalytic Precipitation on Flower-like Bi2S3: Toward Organic Photoelectrochemical Transistor Aptasensing with High Transconductance

“…As an up-and-coming bioanalytics that appropriately integrates photoelectrochemical (PEC) − bioanalysis with organic transistor technologies, − organic photoelectrochemical transistor (OPECT) provides a promising platform for studying the light-matter-bio interactions with reduced background and natural amplification . Essentially, the OPECT operates upon the coupling of an electronic circuit with a source (S)-channel (C)-drain (D) route and an ionic circuit with a photosensitive gate (PG)-electrolyte (E)-C route.…”