Symmetrically Ion‐Gated In‐Plane Metal‐Oxide Transistors for Highly Sensitive and Low‐Voltage Driven Bioelectronics

Abstract

To provide a unique opportunity for on‐chip scaled bioelectronics, a symmetrically gated metal‐oxide electric double layer transistor (EDLT) with ion‐gel (IG) gate dielectric and simple in‐plane Corbino electrode architecture is proposed. Using amorphous indium‐gallium‐zinc oxide (a‐IGZO) semiconductor and IG dielectric layers, low‐voltage driven EDLTs with high ionotronic effects can be realized. More importantly, in contrast to the conventional asymmetric rectangular EDLTs which can cause non‐uniform potential variation in the active channel layer and eventually degrade the sensing performance, the new symmetrical in‐plane type EDLTs achieve high and spatially uniform ion responsive behaviors. The symmetrically gated a‐IGZO EDLTs exhibited a responsivity of 129.4% to 5 ppm mercury (Hg2+) ions which are approximately three times higher than that with conventional electrode structure (responsivity of 38.5%). To confirm the viability of the new device architectures and the findings, the detailed mechanism of the symmetric gating effects in the in‐plane EDLTs with a variety of electrical characterization and 3D fine element analysis simulations is also discussed.

Transistor-Based Synaptic Devices for Neuromorphic Computing

“…This method allows the device to mimic synaptic functions, such as EPSC, STDP, and STP-to-LTP transition. Many synaptic devices have been studied for neuromorphic computing based on these EDL and electrochemical doping mechanisms [90][91][92][93][94][95]. Synaptic transistors based on two-dimensional (2D) materials have also been investigated on the basis of these mechanisms.…”

Passive Gate‐Tunable Kinetic Photovoltage along Semiconductor‐Water Interfaces

“…In recent years, a range of fundamentally distinct devices based on capacitive EDLs has been creatively achieved for energy conversation and transfer. [9][10][11][12] By introducing the moving boundaries of EDLs, some novel electrokinetic phenomena that directly induce electric currents in solids have been observed, in sharp contrast to classical electrokinetic phenomena that could only generate ionic currents. [13,14] For instance, by moving a water droplet on or waving water across a graphene sheet, an output voltage proportional to the moving velocity can be observed across the graphene sheet.…”