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Air-stable synaptic devices based on bismuth triiodide and carbon nanotubes

Nano Research 2022年第6期15卷 5435-5442页

作者： Dandan Hao Junyao Zhang Li Li Ben Yang Pu Guo Shiqi Zhang Jia Huang Interdisciplinary Materials Research Center School of Materials Science and EngineeringFrontiers Science Center for Intelligent Autonomous SystemsTongji UniversityShanghai 201804China Translational Research Institute of Brain and Brain-Like Intelligence Shanghai Fourth People’s Hospital Affiliated to Tongji UniversitySchool of Materials Science and EngineeringTongji UniversityShanghai 200434China

Artificial synaptic devices with the functions of emulating important biological synaptic behaviors are playing an increasingly important role in the development of neuromorphic computing systems.Single-walled carbon nanotubes(SWCNTs)with excellent electrical properties and high stability have been studied as active materials for synaptic devices.However,the performance of optical synaptic devices(OSDs)based on pure SWCNTs is limited by the weak light absorption property.Herein,bismuth triiodide(BiI_(3)),an environmentally stable and friendly optoelectronic material,is firstly combined with SWCNTs to fabricate OSDs with decent properties of perceiving and memorizing optical information.The OSDs can exhibit typical synaptic behaviors including excitatory postsynaptic current,paired-pulse facilitation,and short/long-term memory.Distinctively,the photoresponse of the OSD is independent of pulse light wavelength in the range of 365 to 650 nm,different from most of the previously reported OSDs,which usually have wavelength-dependent photo-response.Temperature-dependent photo-response behaviors of the devices are investigated.Importantly,the OSD without encapsulation holds good excitatory post-synaptic current(EPSC)behavior after being stored in the ambient environment for 170 days,indicating reliable environmental stability.Furthermore,an OSD array with nine synaptic devices is employed to mimic the human visual perception and memory functions.These results suggest the feasibility of BiI3/SWCNTs-based OSDs for the simulation of human visual memory.

关键词： semiconducting single-walled carbon nanotubes bismuth triiodide optical synaptic devices stability human visual memory

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Solution-Processable Copper(Ⅰ) Thiocyanate(CuSCN) as Hole Transport Layers for BiI3 Solar Cells

Solution-Processable Copper(Ⅰ) Thiocyanate(CuSCN) as Hole T...

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第七届新型太阳能电池材料科学与技术学术研讨会

作者： Zhangwei He Tinglei Zhao Huanyu Ma Zhanao Tan Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical Technology

The solar cells have emerged as a series of star technologies in utilization of renewable energy.However,the issues raised by the short lifetime of the photovoltaics and toxic processing have severely limited their potential applications.In this work,we develop a two-step environmentally friendly solution deposition method to fabricate bismuth triiodide(BiI) solar cells.Using the technique,we harvest large size crystals and obtained uniform morphology of BiI film.In addition,we demonstrate the use of solution-processable copper(I) thiocyanate(CuSCN) as hole transport layers in BiI solar cells.The devices display an overall power conversion efficiency of 0.8% under AM 1.5 G illumination.This work provides new strategies for achieving high-efficiency BiI solar cells.

关键词： bismuth triiodide hole transport layer solution-processable photovoltaics

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