Artificial optoelectronic synapses based on Ga2O3 metal–semiconductor–metal solar-blind ultraviolet photodetectors with asymmetric electrodes for neuromorphic computing

Huazhen Sun; Bingjie Ye; Mei Ge; Biao Gong; Leyang Qian; Irina N. Parkhomenko; Fadei F. Komarov; Yu Liu; Guofeng Yang

doi:10.1002/rpm.20240038

Responsive Materials ›› 2025, Vol. 3 ›› Issue (2) :e20240038 DOI: 10.1002/rpm.20240038

RESEARCH ARTICLE

Artificial optoelectronic synapses based on Ga₂O₃ metal–semiconductor–metal solar-blind ultraviolet photodetectors with asymmetric electrodes for neuromorphic computing

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Abstract

Research on optoelectronic synapses that can integrate both detection and processing functions is essential for the development of efficient neuromorphic computing. Here, we experimentally demonstrated an Ga₂O₃-based metal–semiconductor–metal (MSM) solar-blind ultraviolet (UV) photodetector (PD) with asymmetric interdigital electrodes. The Ga₂O₃ PD exhibits a responsivity of 732 A/W under a forward bias of 6 V. The tunable conductance properties of PDs provide a novel approach to synaptic performance. The proposed PDs as artificial synapse realized several essential synaptic function, including excitatory postsynaptic current, paired-pulse facilitation, long-term potentiation, the transition from short-term memory to long-term memory, and learning experience behaviors successfully. At a reverse bias, an ultra-low energy consumption of 140 fJ was achieved. In addition, the optoelectronic synapses demonstrated a recognition accuracy of over 95% in the MNIST handwritten number recognition task. These results suggest that Ga₂O₃ MSM solar-blind UV PDs have high potential for efficient optoelectronic neuromorphic computing applications.

Keywords

asymmetric electrodes / Ga₂O₃ / neuromorphic computing / optoelectronic synapse / solar-blind UV PDs

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Huazhen Sun, Bingjie Ye, Mei Ge, Biao Gong, Leyang Qian, Irina N. Parkhomenko, Fadei F. Komarov, Yu Liu, Guofeng Yang. Artificial optoelectronic synapses based on Ga₂O₃ metal–semiconductor–metal solar-blind ultraviolet photodetectors with asymmetric electrodes for neuromorphic computing. Responsive Materials, 2025, 3(2): e20240038 DOI:10.1002/rpm.20240038

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