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Optoelectronic synapse based on 2D metal-organic framework Cu3(HHTP)2 for neuromorphic processing of both visual and
Lingling Zhang1, Yafei Chen1, Zhenyu Li1
1Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China.
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Two-dimensional conjugated Metal-organic frameworks (2D c-MOFs) hold immense potential in neuromorphic due to their high porosity, excellent specific surface area, highly tunable chemical properties, and excellent electrical conductivity. Herein, a two-terminal optoelectronic synapse based on the Cu3(HHTP)2 film is fabricated using a layer-by-layer self-assembly method. The device demonstrates outstanding synaptic functionalities, including pair-pulse facilitation (PPF), spike-width-dependent plasticity (SWDP) and spike-rate-dependent plasticity (SRDP). Furthermore, the broad absorption of Cu3(HHTP)2 film in the visible light ranges enables the device a broad spectral response, which is crucial for realizing the color distinction and associative memory. Eventually, simulations based on the neuromorphic speech recognition system reveal the device's ability to achieve the high spoken digit recognition accuracy, maintaining robust performance even under noisy environments. These results highlight the potential of Cu3(HHTP)2-based optoelectronic synapses as a promising platform for next-generation neural computing leveraging the unique properties of MOFs.
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