Research On Neuromorphic Pain Perception Based On Ion-regulated Two-dimension MoS₂ Transistor

Since entering the 21st century,the computer based on Von Neumann architecture are facing the problems of"power consumption wall"and"memory wall",which have been difficult to meet our increasing demand for data and information.Inspired by human brain,new synaptic devices and systems have aroused great interest of many researchers.In order to break the traditional von Neumann computing architecture,it is of great significance to design brain-like synaptic devices with high efficiency and low power consumption.In this paper,the basic synaptic biomimetic function,biological pain perception behavior and Pavlovian fear conditioning behavior are simulated by using a polyvinyl alcohol（PVA）polymer-regulated field effect transistor as a biomimetic device.Specifically,the following studies were carried out:1.Preparation and characterization of two-dimensional Mo S₂ field effect transistors.Using silicon wafers with 300 nm oxide layer as the substrate,Mo S₂ transistors were fabricated by spin-coating,UV lithography and evaporation processes.Raman spectroscopy was used to characterize the channel,and the photoelectric properties of the device were further studied based on 405 nm laser.The device has a significant switching current ratio（10³）and excellent optical response,which can be used as a basic device unit to construct future optoelectronic hybrid integrated chips.2.Preparation and characterization of double electric layer grid dielectric（polyvinyl alcohol）thin film and 2D-Mo S₂ hybrid transistor.Organic-inorganic hybrid transistors were prepared by drip coating method using polyvinyl alcohol biopolymer solution as double grid medium.The great advantage of the device structure lies in the use of double electric layer gate medium（EDL）to regulate the emerging PVA/Mo S₂ organic-inorganic hybrid transistor,which can significantly reduce the voltage of the transistor at work,so that the device has excellent low power consumption characteristics,and provides an excellent device for the subsequent bionic function test.3.It is found that the channel current of PVA/Mo S₂ under illumination is obviously higher than that under dark environment.Its current switching ratio(I_on/off)is close to 104.Using a novel organic-inorganic hybrid transistor as an artificial electronic synapse to explore its neuromorphic biomimetic applications.Some important synaptic functions,such as excitatory postsynaptic current（EPSC）,double-pulse facilitation（PPF）,dynamic filtering,spike pulse synaptic plasticity and learning-forget-relearning,have been successfully simulated by electro-optical collaborative pulse training.More importantly,the device can also simulate some advanced neural functions,such as:realization of some important characteristics of nociceptor（pain threshold,pain sensitization and pain desensitization）,Pavlovian fear conditioning simulation,etc.The proposed PVA/Mo S₂ organic-inorganic hybrid transistor device based on PVA/Mo S₂ biopolymer regulation provides a new idea for the development of the next generation of high-performance optoelectronic neuromorphic biomimetic applications.