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Resistive Switching by Percolative Conducting Filaments in Organometal Perovskite Unipolar Memory Devices Analyzed Using Current Noise Spectra

Cited 8 time in Web of Science Cited 8 time in Scopus
Authors

Ahn, Heebeom; Kang, Keehoon; Song, Younggul; Lee, Woocheol; Kim, Jae-Keun; Kim, Junwoo; Lee, Jonghoon; Baek, Kyeong-Yoon; Shin, Jiwon; Lim, Hyungbin; Kim, Yongjin; Lee, Jae Sung; Lee, Takhee

Issue Date
2022-01
Publisher
John Wiley & Sons Ltd.
Citation
Advanced Functional Materials, Vol.32 No.4, p. 2107727
Abstract
Organometal halide perovskites have emerged as potential material systems for resistive memory devices besides their outstanding optical and electrical properties. Although halide-perovskite resistive memory has the advantage of operating with a low voltage and large on/off ratio, random distribution in operation voltage remains a challenge in memory application. This stochastic operation characteristic is due to the random formation of conducting filaments that cause resistance fluctuations in the material. Therefore, it is essential to investigate the formation and dissolution of conducting filaments and their structure. However, direct observation of a nanoscale filamentary structure is often challenging. Moreover, detailed studies of conducting filaments in halide-perovskite materials have rarely been reported. By employing a scaling theory with a fractal structure, this study investigates the geometric structures and dynamics of conducting filaments formed in organometal halide perovskite through current noise analysis. The temperature-dependent electrical properties and current noise demonstrate the role of ion migration in the formation of conducting filaments. The findings could enhance the understanding of the resistive switching phenomena of perovskite resistive memory devices in terms of percolative conducting filaments. Thus, providing a route for achieving a stable memory operation by controlling the relevant structure and dynamics of the switching processes.
ISSN
1616-301X
URI
https://hdl.handle.net/10371/202516
DOI
https://doi.org/10.1002/adfm.202107727
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  • College of Engineering
  • Department of Materials Science & Engineering
Research Area Molecular doping in emerging semiconductors, Next-generation electronic devices, Transport phenomena in organic semiconductors

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