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Vertically aligned two-dimensional halide perovskites for reliably operable artificial synapses

Cited 0 time in Web of Science Cited 61 time in Scopus
Authors

Kim, Seung Ju; Lee, Tae Hyung; Yang, June-Mo; Yang, Jin Wook; Lee, Yoon Jung; Choi, Min-Ju; Lee, Sol A; Suh, Jun Min; Kwak, Kyung Ju; Baek, Ji Hyun; Im, In Hyuk; Lee, Da Eun; Kim, Jae Young; Kim, Jaehyun; Han, Ji Su; Kim, Soo Young; Lee, Donghwa; Park, Nam-Gyu; Jang, Ho Won

Issue Date
2022-01
Publisher
Elsevier BV
Citation
Materials Today, Vol.52, pp.19-30
Abstract
© 2021 Elsevier LtdHalide 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.
ISSN
1369-7021
URI
https://hdl.handle.net/10371/184134
DOI
https://doi.org/10.1016/j.mattod.2021.10.035
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