Substrate Orientation-Dependent Synaptic Plasticity and Visual Memory in Sol–Gel-Derived ZnO Optoelectronic Devices.
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| Title: | Substrate Orientation-Dependent Synaptic Plasticity and Visual Memory in Sol–Gel-Derived ZnO Optoelectronic Devices. |
|---|---|
| Authors: | Jeon, Dabin1 (AUTHOR), Lee, Seung Hun1,2 (AUTHOR), Cho, JungBeen2,3 (AUTHOR), Kim, Kyoung-Bo1,3 (AUTHOR), Lee, Sung-Nam1,2 (AUTHOR) snlee@tukorea.ac.kr |
| Source: | Materials (1996-1944). Sep2025, Vol. 18 Issue 18, p4377. 13p. |
| Subjects: | Visual memory, Optoelectronic devices, Substrates (Materials science), Memorization, Artificial synapses, Neuromorphics, Sol-gel processes |
| Abstract: | We report Al/ZnO/Al optoelectronic synaptic devices fabricated on c-plane and m-plane sapphire substrates using a sol–gel process. The devices exhibit essential synaptic behaviors such as excitatory postsynaptic current modulation, paired-pulse facilitation, and long-term learning–forgetting dynamics described by Wickelgren's power law. Comparative analysis reveals that substrate orientation strongly influences memory performance: devices on m-plane consistently show higher EPSCs, slower decay rates, and superior retention compared to c-plane counterparts. These characteristics are attributed to crystallographic effects that enhance carrier trapping and persistent photoconductivity. To demonstrate their practical applicability, 3 × 3-pixel arrays of adjacent devices were constructed, where a "T"-shaped optical pattern was successfully encoded, learned, and retained across repeated stimulation cycles. These results highlight the critical role of substrate orientation in tailoring synaptic plasticity and memory retention, offering promising prospects for ZnO-based optoelectronic synaptic arrays in in-sensor neuromorphic computing and artificial visual memory systems. [ABSTRACT FROM AUTHOR] |
| Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 188281929 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Substrate Orientation-Dependent Synaptic Plasticity and Visual Memory in Sol–Gel-Derived ZnO Optoelectronic Devices. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Jeon%2C+Dabin%22">Jeon, Dabin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Seung+Hun%22">Lee, Seung Hun</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cho%2C+JungBeen%22">Cho, JungBeen</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kim%2C+Kyoung-Bo%22">Kim, Kyoung-Bo</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Sung-Nam%22">Lee, Sung-Nam</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> snlee@tukorea.ac.kr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Sep2025, Vol. 18 Issue 18, p4377. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Visual+memory%22">Visual memory</searchLink><br /><searchLink fieldCode="DE" term="%22Optoelectronic+devices%22">Optoelectronic devices</searchLink><br /><searchLink fieldCode="DE" term="%22Substrates+%28Materials+science%29%22">Substrates (Materials science)</searchLink><br /><searchLink fieldCode="DE" term="%22Memorization%22">Memorization</searchLink><br /><searchLink fieldCode="DE" term="%22Artificial+synapses%22">Artificial synapses</searchLink><br /><searchLink fieldCode="DE" term="%22Neuromorphics%22">Neuromorphics</searchLink><br /><searchLink fieldCode="DE" term="%22Sol-gel+processes%22">Sol-gel processes</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We report Al/ZnO/Al optoelectronic synaptic devices fabricated on c-plane and m-plane sapphire substrates using a sol–gel process. The devices exhibit essential synaptic behaviors such as excitatory postsynaptic current modulation, paired-pulse facilitation, and long-term learning–forgetting dynamics described by Wickelgren's power law. Comparative analysis reveals that substrate orientation strongly influences memory performance: devices on m-plane consistently show higher EPSCs, slower decay rates, and superior retention compared to c-plane counterparts. These characteristics are attributed to crystallographic effects that enhance carrier trapping and persistent photoconductivity. To demonstrate their practical applicability, 3 × 3-pixel arrays of adjacent devices were constructed, where a "T"-shaped optical pattern was successfully encoded, learned, and retained across repeated stimulation cycles. These results highlight the critical role of substrate orientation in tailoring synaptic plasticity and memory retention, offering promising prospects for ZnO-based optoelectronic synaptic arrays in in-sensor neuromorphic computing and artificial visual memory systems. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=188281929 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/ma18184377 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 4377 Subjects: – SubjectFull: Visual memory Type: general – SubjectFull: Optoelectronic devices Type: general – SubjectFull: Substrates (Materials science) Type: general – SubjectFull: Memorization Type: general – SubjectFull: Artificial synapses Type: general – SubjectFull: Neuromorphics Type: general – SubjectFull: Sol-gel processes Type: general Titles: – TitleFull: Substrate Orientation-Dependent Synaptic Plasticity and Visual Memory in Sol–Gel-Derived ZnO Optoelectronic Devices. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Jeon, Dabin – PersonEntity: Name: NameFull: Lee, Seung Hun – PersonEntity: Name: NameFull: Cho, JungBeen – PersonEntity: Name: NameFull: Kim, Kyoung-Bo – PersonEntity: Name: NameFull: Lee, Sung-Nam IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 09 Text: Sep2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 19961944 Numbering: – Type: volume Value: 18 – Type: issue Value: 18 Titles: – TitleFull: Materials (1996-1944) Type: main |
| ResultId | 1 |
