Integration of Organic Electrochemical and Field‐Effect Transistors for Ultraflexible, High Temporal Resolution Electrophysiology Arrays

Abstract

Integration of organic electrochemical transistors and organic field-effect transistors is successfully realized on a 600 nm thick parylene film toward an electrophysiology array. A single cell of an integrated device and a 2 × 2 electrophysiology array succeed in detecting electromyogram with local stimulation of the motor nerve bundle of a transgenic rat by a laser pulse.

Omnidirectional Strain‐Independent Organic Transistors Integrated onto an Elastomer Template with a Spontaneously Formed Fingerprint‐Mimicking Microtopography

“…[24][25][26] For wearable or skin-attachable OFETs, most researches have focused on not only improving signal quality and mechanical stability, but also eliminating inconvenience when the devices are attached to human skin. [29,30] Someya group used a 60-nm-thick Parylene substrate to obtain a 274-nm-thick dinaphtho[2,3-b:2′,3′-f]thieno [3,2-b] thiophene (DNTT) OFET with a field-effect mobility (µ FET ) of 0.34 cm 2 V −1 s −1 . [29,30] Someya group used a 60-nm-thick Parylene substrate to obtain a 274-nm-thick dinaphtho[2,3-b:2′,3′-f]thieno [3,2-b] thiophene (DNTT) OFET with a field-effect mobility (µ FET ) of 0.34 cm 2 V −1 s −1 .…”

Untethered soft robotics

“…Employing ultrathin films (roughly 1 μ m thick) has enabled the creation of cheap and robust transistors 76 , tactile sensors 76 and LEDs 77 that can be crumpled without losing functionality 76 . In one study, ultrathin organic field-effect transistors were integrated with organic electrochemical transistors (OECTs) to create an intrinsically flexible electrophysiology array 78 (Fig. 4c).…”

Transparent, conformable, active multielectrode array using organic electrochemical transistors

“…However, it does not suffer from cross-talk issues, because the current fluctuation of OECTs is measured without load impedance. Another type of active matrix design-each cell consisting of one OECT and one access transistor-can reduce the power consumption and the cross-talk induced by R L and R W as well as simplify the readout circuit (21,25,26,45); thus, it is expected that integration of transparent OECT and access transistor will further improve the scalability from the viewpoint of power consumption and improved resolution of measurement.…”

“…Because of the aforementioned properties, EEG (18), electrocorticography (ECoG) (17), and ECG (20) have all been measured using OECTs, with high signal-to-noise ratio (SNR) of at least 54 dB (17). Furthermore, integration of OECTs acting as sensors and organic field effect transistors (OFETs) as a multiplexer was used to form an active electrode array (21). In addition to a function of signal amplification, an active matrix design can significantly reduce the total number of wirings to access each microelectrode, realizing a scalable MEA design.…”