Bidirectional All-Optical Synapses Based on a 2D Bi 2 O 2 Se/Graphene Hybrid Structure for Multifunctional Optoelectronics
KAUST DepartmentMaterial Science and Engineering Program
Physical Science and Engineering (PSE) Division
Physical Sciences and Engineering DivisionKing Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia
Online Publication Date2020-05-28
Print Publication Date2020-07
Embargo End Date2021-05-28
Permanent link to this recordhttp://hdl.handle.net/10754/662974
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AbstractNeuromorphic computing has been extensively studied to mimic the brain functions of perception, learning, and memory because it may overcome the von Neumann bottleneck. Here, with the light-induced bidirectional photoresponse of the proposed Bi2O2Se/graphene hybrid structure, its potential use in next-generation neuromorphic hardware is examined with three distinct optoelectronic applications. First, a photodetector based on a Bi2O2Se/graphene hybrid structure presents positive and negative photoresponsibility of 88 and −110 A W−1 achieved by the excitation of visible wavelength and ultraviolet wavelength light at intensities of 1.2 and 0.3 mW cm−2, respectively. Second, this unique photoresponse contributes to the realization of all optically stimulated long-term potentiation or long-term depression to mimic synaptic short-term plasticity and long-term plasticity, which are attributed to the combined effect of photoconductivity, bolometric, and photoinduced desorption. Third, the devices are applied to perform digital logic functions, such as “AND” and “OR,” using full light modulation. The proposed Bi2O2Se/graphene-based optoelectronic device represents an innovative and efficient building block for the development of future multifunctional artificial neuromorphic systems.
CitationYang, C., Chen, T., Verma, D., Li, L., Liu, B., Chang, W., & Lai, C. (2020). Bidirectional All-Optical Synapses Based on a 2D Bi 2 O 2 Se/Graphene Hybrid Structure for Multifunctional Optoelectronics. Advanced Functional Materials, 2001598. doi:10.1002/adfm.202001598
SponsorsThis study was supported by grants from the Ministry of Science and Technology, Taiwan (MOST 108-2221-E-182-060-MY3, MOST 108-2628-E-182-002-MY3 and MOST 108-2218-E-182-002).
JournalAdvanced Functional Materials