Developing GeSbTe superlattice through understanding of the reversible phases and engineering its interspaces

IF 2.5 4区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Physica Status Solidi-Rapid Research Letters Pub Date : 2024-06-28 DOI:10.1002/pssr.202300419

Hyeonwook Lim, Chang Woo Lee, Dasol Kim, Mann-Ho Cho

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Abstract

Interfacial phase‐change materials (iPCM), which are alternatively stacked with GeTe and Sb2Te3 in the superlattice structure, have been highlighted as next‐generation PCM with improved overall phase‐change characteristics. However, several studies have reported that a melt‐quenching process, whereby the initial superlattice structure is not maintained within the reversible switching process, rather than the initially proposed melting‐free phase‐change mechanism, occurs during operation. Herein, GeSbTe superlattices were synthesized using molecular beam epitaxy, and the reversible phases of the superlattice obtained by irradiation with an optical pulsed laser (KrF; 280 nm, 25 ns) and re‐annealing or by applying different electrical pulses were investigated through careful structural analyses. The results revealed that Te atoms are aligned parallel to the interface regardless of the reversible phase, whereas cations and inherent vacancies are distributed differently during the phase‐change process. The stability of memory cells with cycling operations can be enhanced by enriching inherent vacancies, and the switching energy can be reduced by expanding the interspaces via doping engineering.This article is protected by copyright. All rights reserved.

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通过了解可逆相并设计其间隙来开发 GeSbTe 超晶格

界面相变材料（iPCM）是一种在超晶格结构中交替堆叠 GeTe 和 Sb2Te3 的材料，被视为具有更好的整体相变特性的下一代 PCM。然而，一些研究报告指出，在运行过程中会出现熔淬过程，即在可逆转换过程中无法保持初始超晶格结构，而不是最初提出的无熔淬相变机制。本文采用分子束外延技术合成了 GeSbTe 超晶格，并通过仔细的结构分析研究了用光学脉冲激光器（KrF；280 nm，25 ns）辐照超晶格并重新退火或施加不同电脉冲所获得的可逆相。结果表明，无论处于哪种可逆相，碲原子都平行于界面排列，而阳离子和固有空位在相变过程中的分布则有所不同。通过富集固有空位，可以提高存储单元循环操作的稳定性；通过掺杂工程扩大间隙，可以降低开关能量。本文受版权保护。

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来源期刊

Physica Status Solidi-Rapid Research Letters 物理-材料科学：综合

CiteScore

5.20

自引率

3.60%

发文量

208

审稿时长

1.4 months

期刊介绍： Physica status solidi (RRL) - Rapid Research Letters was designed to offer extremely fast publication times and is currently one of the fastest double peer-reviewed publication media in solid state and materials physics. Average times are 11 days from submission to first editorial decision, and 12 days from acceptance to online publication. It communicates important findings with a high degree of novelty and need for express publication, as well as other results of immediate interest to the solid-state physics and materials science community. Published Letters require approval by at least two independent reviewers. The journal covers topics such as preparation, structure and simulation of advanced materials, theoretical and experimental investigations of the atomistic and electronic structure, optical, magnetic, superconducting, ferroelectric and other properties of solids, nanostructures and low-dimensional systems as well as device applications. Rapid Research Letters particularly invites papers from interdisciplinary and emerging new areas of research.

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