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Kangsik, Kim
다차원 탄소재료 연구단
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Unveiling the Effect of Superlattice Interfaces and Intermixing on Phase Change Memory Performance

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Title
Unveiling the Effect of Superlattice Interfaces and Intermixing on Phase Change Memory Performance
Author(s)
Khan, Asir Intisar; Wu, Xiangjin; Perez, Christopher; Won, Byoungjun; Kangsik Kim; Ramesh, Pranav; Kwon, Heungdong; Tung, Maryann C.; Zonghoon Lee; Oh, Il-Kwon; Saraswat, Krishna; Asheghi, Mehdi; Goodson, Kenneth E.; Wong, H. -S. Philip; Pop, Eric
Publication Date
2022-07
Journal
NANO LETTERS, v.22, no.15, pp.6285 - 6291
Publisher
AMER CHEMICAL SOC
Abstract
Superlattice (SL) phase change materials have shown promise to reduce the switching current and resistance drift of phase change memory (PCM). However, the effects of internal SL interfaces and intermixing on PCM performance remain unexplored, although these are essential to understand and ensure reliable memory operation. Here, using nanometer-thin layers of Ge2Sb2Te5 and Sb2Te3 in SL-PCM, we uncover that both switching current density (J(reset)) and resistance drift coefficient (v) decrease as the SL period thickness is reduced (i.e., higher interface density); however, interface intermixing within the SL increases both. The signatures of distinct versus intermixed interfaces also show up in transmission electron microscopy, X-ray diffraction, and thermal conductivity measurements of our SL films. Combining the lessons learned, we simultaneously achieve low J(reset) & AP; 3-4 MA/ cm(2) and ultralow v & AP; 0.002 in mushroom-cell SL-PCM with similar to 110 nm bottom contact diameter, thus advancing SL-PCM for and neuromorphic applications.
URI
https://pr.ibs.re.kr/handle/8788114/12336
DOI
10.1021/acs.nanolett.2c01869
ISSN
1530-6984
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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