Abstract
Optoelectronic synapses have been attracting significant attention due to their important role in visual information processing. In this work, we fabricate an all-organic optoelectronic synaptic device with a double heterojunction structure of PEDOT:PSS/poly(vinylidene fluoridetrifluoroethylene) (P(VDF-TrFE))/copper (II) phthalocyanine (CuPc) by a simple preparation process. The introduction of a dielectric P(VDF-TrFE) layer between PEDOT:PSS and CuPc layers benefits the trapping of charge carriers and slows down the electron-hole recombination rate. This two-terminal optoelectronic device is successfully applied to simulate synaptic functions of biological synapses by using optical pulses of 660 nm, including paired-pulse facilitation, spike-duration dependent plasticity, spike-rate dependent plasticity, spike-number dependent plasticity, and learning-experience behavior. Furthermore, the key characteristics of a nociceptor and the optical logic function of the “AND” and “OR” operations are also emulated. This work illustrates the potential of such device for constructing neuromorphic computing systems at the physical level.
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The authors abide by ethical standards and are funded by the project fund (listed in Acknowledgments). The authors demonstrate that there is no conflict of interest between their current work and any individual/organization. All authors agreed to submit to the original article in Journal of Materials Science: Materials in Electronics. The authors claim that none of the materials in this manuscript has been published or is under consideration for publication elsewhere. All data generated and analyses during this study are included in this published article and its supplementary material. The data that support the finding of this study are available from the corresponding author upon reasonable request.
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Acknowledgments
This work was supported by Shanghai Science and Technology Innovation Action Plan (No. 19JC141670, 21520714100) and NSFC (No. 62004204). The authors thank ECNU Multifunctional Platform for Innovation (004 and 006) for technology support.
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All authors contributed to this study. HP, CL, and RJ contributed to the study conception and design. CJ, BT, HL, and CGD provided experimental conditions support. RJ and RL performed the experiment and acquired the data. RJ, GF, and JL analyzed data. The first draft of the manuscript was written by HP and RJ. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Ji, R., Li, R., Feng, G. et al. Optoelectronic artificial synapses based on copper (II) phthalocyanine with modulated neuroplasticity. J Mater Sci: Mater Electron 33, 18497–18506 (2022). https://doi.org/10.1007/s10854-022-08702-y
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DOI: https://doi.org/10.1007/s10854-022-08702-y