Carbon Nanotube Optoelectronic Synapse Transistor Arrays with Ultra‐Low Power Consumption for Stretchable Neuromorphic Vision Systems

Abstract

High‐performance stretchable optoelectronic synaptic transistor arrays are key units for constructing and mimicking simulated neuromorphic vision systems. In this study, ultra‐low power consumption and low‐operation‐voltage stretchable all‐carbon optoelectronic synaptic thin film transistors (TFTs) using sorted semiconducting single‐walled carbon nanotubes (sc‐SWCNTs) modified with CdSe/ZnS quantum dots as active layers on ionic liquid‐based composite elastomer substrates are first reported. The resulting stretchable TFT devices show enhancement‐mode characteristics with excellent electrical properties (such as the record on/off ratios up to 105, negligible hysteresis, and small subthreshold swing), excellent mechanical tensile properties (such as the only 12.4% and 6.4% degradations of the carrier mobility after 20% vertical and horizontal strain stretching), and optoelectronic synaptic plasticity (for the recognition of Morse codes) with ultra‐low power consumptions (15.38 aJ) at the operating voltage from −1 to 0.2 V. At the same time, the designed nonvolatile conductance of the stretchable SWCNT optoelectronic synapse thin film transistors (SSOSTFTs) stimulated by UV light and the bending angle are first used to simulate stretchable neuromorphic vision systems (including the functions of the crystalline lens and optic cone cells as bionic eyes) for detecting the atmospheric environment with a record accuracy of 95.1% as a bionic eye.

High‐Density Artificial Synapse Array Consisting of Homogeneous Electrolyte‐Gated Transistors

“…g) Previous works on integration of transistor‐based synaptic device. The types of synaptic devices include EGT, [ 57–59 ] floating‐gated transistor (FGT), [ 60,61 ] ferroelectric field‐effect transistor (FeFET), [ 53,62,63 ] and transistor with 2D materials as channel (2D‐FET). [ 64–66 ]…”

Materials-Driven Soft Wearable Bioelectronics for Connected Healthcare

“…179−182 CdSe/ZnS quantum dots modified SWCNTs were used as the channel material for a stretchable artificial synaptic transistor that could suppress the aforementioned drawbacks. 183 The device exhibited a high switching ratio (10 5 ), low operating voltage (−1 to 0.2 V), high stretchability (80%), but ultralow energy consumption (15.28 aJ). It was further connected with neural networks as a bionic eye to mimic the function of lenses and opticone cells in human eyes for detecting the atmospheric environment with 95.1% accuracy.…”

“…All-carbon-based stretchable transistors always suffer from low switching ratios and mobility, high-operating voltages, and high-power consumption. − CdSe/ZnS quantum dots modified SWCNTs were used as the channel material for a stretchable artificial synaptic transistor that could suppress the aforementioned drawbacks . The device exhibited a high switching ratio (10 5 ), low operating voltage (−1 to 0.2 V), high stretchability (80%), but ultralow energy consumption (15.28 aJ).…”

High‐Performance Synaptic Phototransistor Using A Photoactive Self‐Assembled Layer toward Ultralow Energy Consumption

“…(Figure 5f; Table S3, Supporting Information). [10,12,21,30,[48][49][50][51][52][53][54][55][56] In addition, the energy consumption of the light source was calculated according to the equation E optical = S × P × t, where S is the area between two electrodes, P represents the light intensity, and t is the spike width. and the optical energy consumption of the device with 530-nm light illumination of and intensity of 6.3 mW cm −2 is 157 nJ.…”