van der Waals(vdW)metal–semiconductor interfaces offer new pathways for overcoming Fermi level pinning(FLP)in 2D electronic and optoelectronic devices.Herein,we demonstrate an ultrasensitive and spectrally selective ...van der Waals(vdW)metal–semiconductor interfaces offer new pathways for overcoming Fermi level pinning(FLP)in 2D electronic and optoelectronic devices.Herein,we demonstrate an ultrasensitive and spectrally selective photodetector based on a WSe_(2)/MoS_(2)heterojunction,in which a vdW metal contact significantly suppresses FLP by minimizing mid-gap states at the contact interface.This dramatically enhances carrier injection and transport efficiency.The photodetector exhibits narrowband wavelength discrimination as fine as 5 nm,even in the IR region,with an accuracy of over 99%in heart rate detection compared with commercial photoplethysmography systems.Our strategy establishes a universal framework for precision optical sensing and infrared signal recognition,paving the way for high-performance intelligent optoelectronic systems.展开更多
This study presents dual-mode memory transistor that accommodates memory and synaptic operations utilizing photoinduced charge trapping at the interface between poly(1,4-butanediol diacrylate)(pBDDA)and Parylene diele...This study presents dual-mode memory transistor that accommodates memory and synaptic operations utilizing photoinduced charge trapping at the interface between poly(1,4-butanediol diacrylate)(pBDDA)and Parylene dielectric layer.Memory characteristics were implemented based on the photoresponsivity of dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene(DNTT),enabling instantaneous electron storage under combined optical and electrical inputs,with retention times up to 10,000 s.Meanwhile,synaptic characteristics were induced by gradual charge trapping via optical pulse stimulation.Synaptic plasticity was confirmed via the potentiation-depression curve,emulating key features of biological nervous system,namely short-term memory(STM)and long-term memory(LTM).Furthermore,the fingerprint recognition tasks highlighted identification and authentication abilities by incorporating our synaptic function into an artificial neural network(ANN).The dual-mode memory transistor,fabricated on a business card,showed excellent compatibility with flexible optoelectronics,maintaining stable memory and synaptic performance over 500 bending cycles with minimal changes in memory window,memory ratio,and potentiation-depression behavior.展开更多
基金supported by the Technology Innovation Program-Next-Generation Intelligent Semiconductor Program(20025643)funded by the Ministry of Trade,Industry and Energy(MOTIE),Republic of Koreasupported by the National Research Foundation of Korea(NRF)grant funded by the Korean Government(MSIT)(No.RS-2023-00260527).
文摘van der Waals(vdW)metal–semiconductor interfaces offer new pathways for overcoming Fermi level pinning(FLP)in 2D electronic and optoelectronic devices.Herein,we demonstrate an ultrasensitive and spectrally selective photodetector based on a WSe_(2)/MoS_(2)heterojunction,in which a vdW metal contact significantly suppresses FLP by minimizing mid-gap states at the contact interface.This dramatically enhances carrier injection and transport efficiency.The photodetector exhibits narrowband wavelength discrimination as fine as 5 nm,even in the IR region,with an accuracy of over 99%in heart rate detection compared with commercial photoplethysmography systems.Our strategy establishes a universal framework for precision optical sensing and infrared signal recognition,paving the way for high-performance intelligent optoelectronic systems.
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korean Government(MSIT)(RS-2023-00210194,RS-2024-00438999,RS-2024-00442020,RS-2024-00454508)supported by Institute of Information&communications Technology Planning&Evaluation(IITP)under the artificial intelligence semiconductor support program to nurture the best talents(IITP-(2025)-RS-2023-00253914)grant funded by the Korea government(MSIT)and the research fund of Hanyang University(HY-2024-2696).
文摘This study presents dual-mode memory transistor that accommodates memory and synaptic operations utilizing photoinduced charge trapping at the interface between poly(1,4-butanediol diacrylate)(pBDDA)and Parylene dielectric layer.Memory characteristics were implemented based on the photoresponsivity of dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene(DNTT),enabling instantaneous electron storage under combined optical and electrical inputs,with retention times up to 10,000 s.Meanwhile,synaptic characteristics were induced by gradual charge trapping via optical pulse stimulation.Synaptic plasticity was confirmed via the potentiation-depression curve,emulating key features of biological nervous system,namely short-term memory(STM)and long-term memory(LTM).Furthermore,the fingerprint recognition tasks highlighted identification and authentication abilities by incorporating our synaptic function into an artificial neural network(ANN).The dual-mode memory transistor,fabricated on a business card,showed excellent compatibility with flexible optoelectronics,maintaining stable memory and synaptic performance over 500 bending cycles with minimal changes in memory window,memory ratio,and potentiation-depression behavior.
