Vertically aligned two-dimensional halide perovskites for reliably operable artificial synapses
Seung Ju Kim a, Ho Won Jang a b
a Department of Materials Science and Engineering, Seoul National University, Daehak-dong, Gwanak-gu, seoul, 151-744, Korea, Republic of
b Advanced Institute of Convergence Technology, Seoul National University
Proceedings of International Conference on Perovskite Memristors and Electronics 2021 (ICPME2021)
Online, Spain, 2021 December 13th - 14th
Organizers: Ho Won Jang and Ankur Solanki
Poster, Seung Ju Kim, 013
Publication date: 1st December 2021

Halide perovskites, fascinating memristive materials owing to mixed ionic-electronic conductivity, have been attracting great attention as artificial synapses recently. However, polycrystalline nature in thin film form and instability under ambient air hamper them to be implemented in demonstrating reliable neuromorphic devices. Here, we successfully fabricated vertically aligned 2D halide perovskite films (V-HPs) for active layers of artificial synapses, showing moisture stability for several months. Unlike random-oriented HPs, which exhibit negligible current hysteresis, the V-HPs possess multilevel analog memristive characteristics, programmable potentiation and depression with distinguished multi-states, long-short-term plasticity, paired-pulse facilitation, and even spike-timing-dependent plasticity. Furthermore, high classification accuracy is obtained with implementation in deep neural networks. These remarkable improvements are attributed to the vertically well-aligned lead iodide octahedra acting as the ion transport channel, confirmed by first-principles calculations. This study paves the way for understanding HPs nanophysics and demonstrating their potential utility in neuromorphic computing systems.

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