An all-solution-processed tactile memory flexible device integrated with a NiO ReRAM

Abstract

Flexible electronics have great potential as the next class of macroscale multi-sensing devices capable of collecting a variety of information from diverse surfaces. A platform to integrate different electric components on a flexible substrate for macroscale electronics without increasing device fabrication costs needs to be explored. To address this requirement, we demonstrate an all-solution-processed tactile touch memory flexible device integrated with a NiO ReRAM, a tactile touch sensor, and resistors. The function of the solution-processed NiO ReRAM is attributed to a threshold switching mechanism due to the charge trap in the NiO film and the trap-controlled space-charge-limited current. In terms of device operations, the NiO ReRAM is mechanically stable with an on/off current ratio more than 10³ while bending the substrate with a radius up to 6.1 mm. As a proof-of-concept for device applications, a tactile touch memory device, which has functions of writing and erasing tactile touch information by applying a tactile touch and SET/RESET voltage, respectively, is successfully operated. The results are promising to advance all-solution-based macroscale flexible electronics.