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We demonstrate a two-terminal optoelectronic synaptic device based on the poly-crystal diamond to incorporate persistent photoconductive (PPC) behavior into optoelectronic synapse. The inherent photosensitive memory nature is derived from the PPC effect induced by defects including grain boundary, color center, C vacancy, and non-diamond phase, which successfully mimics the dynamics of biological synapses. More importantly, the intentionally introduced N related deep levels contribute to the longevity of the photo-excited carriers, offering a nonvolatile photo-switch in a diamond device. The diamond synapse realizes a maximum paired pulse facilitation (PPF) index of 174 % and effectively imitate the learning-forgetting-relearning behavior of human brain. Moreover, an encryption strategy is proposed inspired by the synaptic device, offering a new way to improve the security in optical communication.

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• In Copyright
  

Keyword: Diamond, photodetector

Date published: 2025-10-29

Publisher: Elsevier BV

Journal:

• Materials Today Physics (ISSN: 25425293) vol. 59 101919

Funding:

• Zhejiang University State Key Laboratory of Silicon and Advanced Semiconductor Materials
• National Natural Science Foundation of China

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5852

First published URL: https://doi.org/10.1016/j.mtphys.2025.101919

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Updated at: 2025-11-05 12:30:10 +0900

Published on MDR: 2025-11-05 12:24:44 +0900