Ambient Stable All Inorganic CsCu₂I₃ Artificial Synapses for Neurocomputing.

Area of Science:

• Materials Science
• Neuroscience
• Electronics

Background:

• Halide perovskites are explored for resistive switching memories and artificial synapses due to ion migration and synthesis.
• Artificial synaptic devices mimic biological synapses for in-memory computing.

Purpose of the Study:

• To investigate the potential of environmentally friendly and air-stable CsCu2I3 perovskite films in artificial synaptic devices.
• To evaluate the synaptic plasticity and long-term stability of CsCu2I3-based artificial synapses.
• To assess the performance of these artificial synapses in deep neural network applications.

Main Methods:

• Fabrication of artificial synapses using CsCu2I3 perovskite as the active layer between Au and ITO electrodes.
• Characterization of synaptic plasticity, including long-term and short-term plasticity, paired-pulse facilitation, and spike-timing-dependent plasticity.
• Assessment of device performance and stability under ambient conditions for 160 days.
• Evaluation of learning accuracy using MNIST and Fashion MNIST datasets.

Main Results:

• The Au/CsCu2I3/ITO/glass devices exhibited tunable synaptic plasticities (potentiation and depression).
• Device performance remained stable for 160 days under ambient conditions.
• CsCu2I3-based artificial synapses achieved high learning accuracy on MNIST and Fashion MNIST datasets.

Conclusions:

• CsCu2I3 perovskite films are promising for developing stable and high-performance artificial synaptic devices.
• The study demonstrates the potential of B-site engineered halide perovskites for next-generation in-memory hardware.
• These findings pave the way for advanced neuromorphic computing applications.