Reservoir computing(RC)presents a computationally efficient alternative to conventional recurrent neural networks(RNNs)for temporal-data processing.Traditional bio-inspired auditory systems often face constraints due ...Reservoir computing(RC)presents a computationally efficient alternative to conventional recurrent neural networks(RNNs)for temporal-data processing.Traditional bio-inspired auditory systems often face constraints due to limited computational power and high energy consumption,which impede speech-recognition accuracy.In this work,we demonstrate high-performance ferroelectric neuromorphic devices based on TiN/WO_(x)/Hf_(0.5)Zr_(0.5)O_(2)(HZO,4 nm)/TiN heterostructures for constructing an artificial auditory nervous system for efficient voice recognition.The device exhibited a high remanent polarization(P_(r))of approximately 20.58μC cm^(–2)at 1.8 V and endurance exceeding 10^(10)cycles.Density functional theory calculations and experiments confirm that the WO_(x)interlayer regulates oxygen vacancy formation and migration within the HZO layer.By emulating essential biological synaptic plasticity functions,such as paired-pulse facilitation and long-term potentiation/inhibition,the ferroelectric tunnel junction-based devices can perform signal processing and neural computation within the RC framework,achieving an accuracy beyond 99%across 12 categories of everyday vocabulary voice words.These findings provide a promising pathway for developing highly reliable and energy-efficient neuromorphic artificial auditory systems.展开更多
As an alternative to the ultraviolet light-emitting diode(UV LED),the feasibility of utilizing UV micro-LED in the charge management in the detection of gravitational waves in space is experimentally studied.Compared ...As an alternative to the ultraviolet light-emitting diode(UV LED),the feasibility of utilizing UV micro-LED in the charge management in the detection of gravitational waves in space is experimentally studied.Compared with UV LED,micro-LED is more compact in size and has better current spreading,faster response time,and longer operating life.Performance characteristics of micro-LEDs were measured,with peak wavelengths of 254,262,274,and 282 nm for each respective micro-LED,and the photoelectric effect was demonstrated.The effectiveness of micro-LED-based charge management experiments was demonstrated using above micro-LEDs mounted on a cubical test mass,and different discharge rates were achieved by varying the drive current and duty cycle using pulse width modulation.Laboratory data were also shown to demonstrate the space qualification of the micro-LED device.The key electrical and optical characteristics of the micro-LEDs showed less than 5%variation.The results of the qualification bring the micro-LED device technology readiness level(TRL)to TRL-5.TRL-6 will be reached provided additional radiation and thermal tests are conducted and in a position ready to be flown and further tested in space.展开更多
基金supported in part by STI 2030—Major Projects under Grant 2022ZD0209200in part by the National Natural Science Foundation of China under Grant Nos.62374099,52272160,and U2330112+2 种基金in part by the Beijing Natural Science Foundation-Xiaomi Innovation Joint Fund(L233009)the Beijing Natural Science Foundation(L248104)in part by the Independent Research Program of the School of Integrated Circuits,Tsinghua University,in part by the Tsinghua University Fuzhou Data Technology Joint Research Institute.This work was also sponsored by the CIE-Tencent Robotics X Rhino-Bird Focused Research Program.
文摘Reservoir computing(RC)presents a computationally efficient alternative to conventional recurrent neural networks(RNNs)for temporal-data processing.Traditional bio-inspired auditory systems often face constraints due to limited computational power and high energy consumption,which impede speech-recognition accuracy.In this work,we demonstrate high-performance ferroelectric neuromorphic devices based on TiN/WO_(x)/Hf_(0.5)Zr_(0.5)O_(2)(HZO,4 nm)/TiN heterostructures for constructing an artificial auditory nervous system for efficient voice recognition.The device exhibited a high remanent polarization(P_(r))of approximately 20.58μC cm^(–2)at 1.8 V and endurance exceeding 10^(10)cycles.Density functional theory calculations and experiments confirm that the WO_(x)interlayer regulates oxygen vacancy formation and migration within the HZO layer.By emulating essential biological synaptic plasticity functions,such as paired-pulse facilitation and long-term potentiation/inhibition,the ferroelectric tunnel junction-based devices can perform signal processing and neural computation within the RC framework,achieving an accuracy beyond 99%across 12 categories of everyday vocabulary voice words.These findings provide a promising pathway for developing highly reliable and energy-efficient neuromorphic artificial auditory systems.
基金supported by the National Key R&D Program of China(Task No.2021YFC2202500).
文摘As an alternative to the ultraviolet light-emitting diode(UV LED),the feasibility of utilizing UV micro-LED in the charge management in the detection of gravitational waves in space is experimentally studied.Compared with UV LED,micro-LED is more compact in size and has better current spreading,faster response time,and longer operating life.Performance characteristics of micro-LEDs were measured,with peak wavelengths of 254,262,274,and 282 nm for each respective micro-LED,and the photoelectric effect was demonstrated.The effectiveness of micro-LED-based charge management experiments was demonstrated using above micro-LEDs mounted on a cubical test mass,and different discharge rates were achieved by varying the drive current and duty cycle using pulse width modulation.Laboratory data were also shown to demonstrate the space qualification of the micro-LED device.The key electrical and optical characteristics of the micro-LEDs showed less than 5%variation.The results of the qualification bring the micro-LED device technology readiness level(TRL)to TRL-5.TRL-6 will be reached provided additional radiation and thermal tests are conducted and in a position ready to be flown and further tested in space.
