1
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Song WX, Tang Q, Zhao J, Veron M, Zhou X, Zheng Y, Cai D, Cheng Y, Xin T, Liu ZP, Song Z. Tuning the Crystallization Mechanism by Composition Vacancy in Phase Change Materials. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38498850 DOI: 10.1021/acsami.3c18538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
Interface-influenced crystallization is crucial to understanding the nucleation- and growth-dominated crystallization mechanisms in phase-change materials (PCMs), but little is known. Here, we find that composition vacancy can reduce the interface energy by decreasing the coordinate number (CN) at the interface. Compared to growth-dominated GeTe, nucleation-dominated Ge2Sb2Te5 (GST) exhibits composition vacancies in the (111) interface to saturate or stabilize the Te-terminated plane. Together, the experimental and computational results provide evidence that GST prefers (111) with reduced CN. Furthermore, the (8 - n) bonding rule, rather than CN6, in the nuclei of both GeTe and GST results in lower interface energy, allowing crystallization to be observed at the simulation time in general PCMs. In comparison to GeTe, the reduced CN in the GST nuclei further decreases the interface energy, promoting faster nucleation. Our findings provide an approach to designing ultrafast phase-change memory through vacancy-stabilized interfaces.
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Affiliation(s)
- Wen-Xiong Song
- National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Qiongyan Tang
- Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics, East China Normal University, Shanghai 200241, China
| | - Jin Zhao
- National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Muriel Veron
- University Grenoble Alpes, CNRS, SIMAP, 38000 Grenoble, France
| | - Xilin Zhou
- National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Yonghui Zheng
- Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics, East China Normal University, Shanghai 200241, China
| | - Daolin Cai
- National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Yan Cheng
- Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics, East China Normal University, Shanghai 200241, China
| | - Tianjiao Xin
- National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Zhi-Pan Liu
- Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Zhitang Song
- National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
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2
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Christie JK. Review: understanding the properties of amorphous materials with high-performance computing methods. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2023; 381:20220251. [PMID: 37211037 DOI: 10.1098/rsta.2022.0251] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 03/20/2023] [Indexed: 05/23/2023]
Abstract
Amorphous materials have no long-range order in their atomic structure. This makes much of the formalism for the study of crystalline materials irrelevant, and so elucidating their structure and properties is challenging. The use of computational methods is a powerful complement to experimental studies, and in this paper we review the use of high-performance computing methods in the simulation of amorphous materials. Five case studies are presented to showcase the wide range of materials and computational methods available to practitioners in this field. This article is part of a discussion meeting issue 'Supercomputing simulations of advanced materials'.
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Affiliation(s)
- J K Christie
- Department of Materials, Loughborough University, Loughborough LE11 3TU, UK
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3
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Portavoce A, Roland G, Remondina J, Descoins M, Bertoglio M, Amalraj M, Eyméoud P, Dutartre D, Lorut F, Putero M. Kinetic Monte Carlo simulations of Ge-Sb-Te thin film crystallization. NANOTECHNOLOGY 2022; 33:295601. [PMID: 35439738 DOI: 10.1088/1361-6528/ac6813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 04/19/2022] [Indexed: 06/14/2023]
Abstract
Simulation of atomic redistribution in Ge-Sb-Te (GST)-based memory cells during SET/RESET cycling is needed in order to understand GST memory cell failure and to design improved non-volatile memories. However, this type of atomic scale simulations is extremely challenging. In this work, we propose to use a simplified GST system in order to catch the basics of atomic redistribution in Ge-rich GST (GrGST) films using atomistic kinetic Monte Carlo simulations. Comparison between experiments and simulations shows good agreements regarding the influence of Ge excess on GrGST crystallization, as well as concerning the GST growth kinetic in GrGST films, suggesting the crystallized GST ternary compound to be off-stoichiometric. According to the simulation of atomic redistribution in GrGST films during SET/RESET cycling, the film microstructure stabilized during cycling is significantly dependent of the GST ternary phase stoichiometry. The use of amorphous layers exhibiting the GST ternary phase stoichiometry placed at the bottom or at the top of the GrGST layer is shown to be a way of controlling the microstructure evolution of the film during cycling. The significant evolution of the local composition in the amorphous solution during cycling suggests a non-negligible variation of the crystallization temperature with operation time.
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Affiliation(s)
- A Portavoce
- Aix-Marseille University/CNRS, IM2NP, Faculté des Sciences de Saint-Jérôme case 142, F-13397 Marseille, France
| | - G Roland
- Aix-Marseille University/CNRS, IM2NP, Faculté des Sciences de Saint-Jérôme case 142, F-13397 Marseille, France
- STMicroelectronics, 850 Rue Jean Monnet, F-38920 Crolles, France
| | - J Remondina
- Aix-Marseille University/CNRS, IM2NP, Faculté des Sciences de Saint-Jérôme case 142, F-13397 Marseille, France
| | - M Descoins
- Aix-Marseille University/CNRS, IM2NP, Faculté des Sciences de Saint-Jérôme case 142, F-13397 Marseille, France
| | - M Bertoglio
- Aix-Marseille University/CNRS, IM2NP, Faculté des Sciences de Saint-Jérôme case 142, F-13397 Marseille, France
| | - M Amalraj
- Aix-Marseille University/CNRS, IM2NP, Faculté des Sciences de Saint-Jérôme case 142, F-13397 Marseille, France
| | - P Eyméoud
- Aix-Marseille University/CNRS, IM2NP, Faculté des Sciences de Saint-Jérôme case 142, F-13397 Marseille, France
| | - D Dutartre
- STMicroelectronics, 850 Rue Jean Monnet, F-38920 Crolles, France
| | - F Lorut
- STMicroelectronics, 850 Rue Jean Monnet, F-38920 Crolles, France
| | - M Putero
- Aix-Marseille University/CNRS, IM2NP, Faculté des Sciences de Saint-Jérôme case 142, F-13397 Marseille, France
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4
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Lee TH, Elliott SR. Hypervalency in amorphous chalcogenides. Nat Commun 2022; 13:1458. [PMID: 35304462 PMCID: PMC8933559 DOI: 10.1038/s41467-022-29054-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 02/18/2022] [Indexed: 11/09/2022] Open
Abstract
The concept of hypervalency emerged as a notion for chemical bonding in molecules to explain the atomic coordination in hypervalent molecules that violates the electron-octet rule. Despite its significance, however, hypervalency in condensed phases, such as amorphous solids, remains largely unexplored. Using ab initio molecular-dynamics simulations, we report here the underlying principles of hypervalency in amorphous chalcogenide materials, in terms of the behaviour of hypervalent structural units, and its implicit relationship with material properties. The origin of a material-dependent tendency towards hypervalency is made evident with the multi-centre hyperbonding model, from which its relationship to abnormally large Born effective charges is also unambiguously revealed. The hyperbonding model is here extended to include interactions with cation s2 lone pairs (LPs); such deep-lying LPs can also play a significant role in determining the properties of these chalcogenide materials. The role of hypervalency constitutes an indispensable and important part of chemical interactions in amorphous and crystalline chalcogenide solids.
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Affiliation(s)
- T H Lee
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK. .,School of Materials Science and Engineering, Kyungpook National University, Daegu, South Korea.
| | - S R Elliott
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK. .,Trinity College, Cambridge, CB2 1TQ, UK. .,Department of Chemistry, University of Oxford, Oxford, OX1 3TF, UK.
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5
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Xu Y, Zhou Y, Wang XD, Zhang W, Ma E, Deringer VL, Mazzarello R. Unraveling Crystallization Mechanisms and Electronic Structure of Phase-Change Materials by Large-Scale Ab Initio Simulations. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2109139. [PMID: 34994023 DOI: 10.1002/adma.202109139] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/17/2021] [Indexed: 06/14/2023]
Abstract
Ge-Sb-Te ("GST") alloys are leading phase-change materials for digital memories and neuro-inspired computing. Upon fast crystallization, these materials form rocksalt-like phases with large structural and vacancy disorder, leading to an insulating phase at low temperature. Here, a comprehensive description of crystallization, structural disorder, and electronic properties of GeSb2 Te4 based on realistic, quantum-mechanically based ("ab initio") computer simulations with system sizes of more than 1000 atoms is provided. It is shown how an analysis of the crystallization mechanism based on the smooth overlap of atomic positions kernel reveals the evolution of both geometrical and chemical order. The connection between structural and electronic properties of the disordered, as-crystallized models, which are relevant to the transport properties of GST, is then studied. Furthermore, it is shown how antisite defects and extended Sb-rich motifs can lead to Anderson localization in the conduction band. Beyond memory applications, these findings are therefore more generally relevant to disordered rocksalt-like chalcogenides that exhibit self-doping, since they can explain the origin of Anderson insulating behavior in both p- and n-doped chalcogenide materials.
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Affiliation(s)
- Yazhi Xu
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China
- Institute for Theoretical Solid State Physics, RWTH Aachen University, Aachen, 52056, Germany
| | - Yuxing Zhou
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, UK
| | - Xu-Dong Wang
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China
- Center for Alloy Innovation and Design (CAID), School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Wei Zhang
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China
- Center for Alloy Innovation and Design (CAID), School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
- Pazhou Lab, Pengcheng National Laboratory in Guangzhou, Guangzhou, 510320, China
| | - En Ma
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China
- Center for Alloy Innovation and Design (CAID), School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Volker L Deringer
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, UK
| | - Riccardo Mazzarello
- Institute for Theoretical Solid State Physics, RWTH Aachen University, Aachen, 52056, Germany
- JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen, 52056, Germany
- Department of Physics, Sapienza University of Rome, Rome, 00185, Italy
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6
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Rules of hierarchical melt and coordinate bond to design crystallization in doped phase change materials. Nat Commun 2021; 12:6473. [PMID: 34753920 PMCID: PMC8578292 DOI: 10.1038/s41467-021-26696-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 09/27/2021] [Indexed: 11/23/2022] Open
Abstract
While alloy design has practically shown an efficient strategy to mediate two seemingly conflicted performances of writing speed and data retention in phase-change memory, the detailed kinetic pathway of alloy-tuned crystallization is still unclear. Here, we propose hierarchical melt and coordinate bond strategies to solve them, where the former stabilizes a medium-range crystal-like region and the latter provides a rule to stabilize amorphous. The Er0.52Sb2Te3 compound we designed achieves writing speed of 3.2 ns and ten-year data retention of 161 °C. We provide a direct atomic-level evidence that two neighbor Er atoms stabilize a medium-range crystal-like region, acting as a precursor to accelerate crystallization; meanwhile, the stabilized amorphous originates from the formation of coordinate bonds by sharing lone-pair electrons of chalcogenide atoms with the empty 5d orbitals of Er atoms. The two rules pave the way for the development of storage-class memory with comprehensive performance to achieve next technological node. In phase-change memory, writing speed and data retention are two seemingly conflicting performances. Here the authors report hierarchical melt and coordinate bond strategies to stabilize a medium-range crystal-like region and amorphous region, respectively.
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7
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Han JH, Jeong H, Park H, Kwon H, Kim D, Lim D, Baik SJ, Kwon YK, Cho MH. Enhanced reliability of phase-change memory via modulation of local structure and chemical bonding by incorporating carbon in Ge 2Sb 2Te 5. RSC Adv 2021; 11:22479-22488. [PMID: 35480803 PMCID: PMC9034215 DOI: 10.1039/d1ra02210e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 06/21/2021] [Indexed: 12/22/2022] Open
Abstract
In this study, we investigated the effect of phase-change characteristics on the device performance of carbon-incorporated Ge2Sb2Te5 (CGST) to understand the origin of the enhanced reliability and stabilization of the device. Macroscopic and microscopic measurements confirmed that the structural stability significantly increased with the incorporation of as much as 10% carbon. After the completion of bond formation between C and Ge, the excess C (>5 atomic%) engages in bonding with Sb in localized regions because of the difference in formation energy. These bonds of C with Ge and Sb induce non-uniform local charge density of the short-range order. Finally, because the strong bonds between Ge and C shorten the short Ge-Te bonds, the high thermal stability of CGST relative to that of GST can be attributed to intensified Peierls distortion. The formation of strong bonds successfully underpins the local structures and reduces the stochastic effect. Moreover, extension of the C bonding to Sb enhances the structural reliability, resulting in highly stable CGST in the amorphous phase. Finally, the device stability of CGST in the reset state of the amorphous structure during the device switching process was significantly improved.
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Affiliation(s)
- Jeong Hwa Han
- Department of Physics, Yonsei University Seoul 03722 Republic of Korea
| | - Hun Jeong
- Department of Physics, Yonsei University Seoul 03722 Republic of Korea
| | - Hanjin Park
- Department of Physics, Research Institute for Basic Sciences, Kyung Hee University Seoul 02447 Republic of Korea
| | - Hoedon Kwon
- Department of Physics, Yonsei University Seoul 03722 Republic of Korea
| | - Dasol Kim
- Department of Physics, Yonsei University Seoul 03722 Republic of Korea
| | - Donghyeok Lim
- Department of Materials Science and Engineering, UNIST Ulsan 44919 Republic of Korea
| | - Seung Jae Baik
- Faculty of Electronic and Electrical Engineering, Hankyong National University Anseong 17579 Republic of Korea
| | - Young-Kyun Kwon
- Department of Physics, Research Institute for Basic Sciences, Kyung Hee University Seoul 02447 Republic of Korea .,Department of Information Display, Kyung Hee University Seoul 02447 Republic of Korea
| | - Mann-Ho Cho
- Department of Physics, Yonsei University Seoul 03722 Republic of Korea .,Department of System Semiconductor Engineering, Yonsei University Seoul 03722 Republic of Korea
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8
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Kang L, Chen L. First-principles study of the liquid and amorphous phases of Sb 2Te phase change memory material. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:165703. [PMID: 33740774 DOI: 10.1088/1361-648x/abf077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 03/19/2021] [Indexed: 06/12/2023]
Abstract
We have investigated the local structure of liquid and amorphous phases of Sb2Te phase change memory material by the means of density functional theory-molecular dynamics simulations. The models of liquid and amorphous states were generated by quenching from the melt. The results show that the local environment of liquid Sb2Te is a mixed bonding geometry, where the average coordination numbers (CNs) of Sb and Te atoms are 4.93 and 4.23, respectively. Compared with crystalline state, there are more Sb-Sb bonds (∼53%) and less Sb-Te bonds (∼42%) with the presence of Te-Te bonds (∼5%) in liquid Sb2Te. Therefore, the formation of homopolar bonds and the breaking of heteropolar bonds are important structural transformations in melt process. For amorphous Sb2Te, the average CNs of Sb and Te atoms are 4.54 and 3.57, respectively. They are mostly in an octahedral environment, similar to the case in crystalline phase. The fractions of Sb-Sb, Te-Te, and Sb-Te bonds are ∼52%, ∼2%, and ∼46%, respectively. Thus, the increase in the fraction of octahedron accompanied with the decrease in average CN is the major structural changes in quenching process. Furthermore, the octahedral geometry in both the crystalline and amorphous Sb2Te increases the local structural similarity, facilitating the rapid low-energy crystallization.
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Affiliation(s)
- Lei Kang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - Leng Chen
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
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9
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Affiliation(s)
- Hajime Tanaka
- Department of Fundamental Engineering, Institute of Industrial Science, University of Tokyo, Meguro-ku, Tokyo 153-8505, Japan
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10
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Choi YJ, Jhi SH. Efficient Training of Machine Learning Potentials by a Randomized Atomic-System Generator. J Phys Chem B 2020; 124:8704-8710. [PMID: 32910653 DOI: 10.1021/acs.jpcb.0c05075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Machine learning potentials provide an efficient and comprehensive tool to simulate large-scale systems inaccessible by conventional first-principles methods still in a similar level of accuracy. One critical issue in constructing machine learning potentials is to build training data sets cost-effectively that can represent the potential energy surface in a wide range of configurations. We develop a scheme named randomized atomic-system generator (RAG) to produce the training sets that widely cover the potential energy surface by combining the random sampling and structural optimization. We apply the scheme to construct the machine learning potentials for simulation of chalcogen-based phase change materials. Constructed machine learning potentials successfully simulate the dynamics of melting and crystallization processes of binary GeTe at a level comparable to first-principles simulations. The visual analysis shows that the RAG-generated training set represents the crystallization process including the amorphous phases. From the velocity autocorrelation function obtained from the molecular dynamics simulations, we calculate the phonon density of states to analyze the vibrational properties during crystallization.
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Affiliation(s)
- Young-Jae Choi
- Department of Physics, POSTECH, Cheongam-ro 77, Pohang 37673, Republic of Korea
| | - Seung-Hoon Jhi
- Department of Physics, POSTECH, Cheongam-ro 77, Pohang 37673, Republic of Korea
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11
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Qiao C, Guo YR, Wang S, Jia Y, Wang CZ, Ho KM. Origin of short- and medium-range order in supercooled liquid Ge 3Sb 2Te 6 using ab initio molecular dynamics simulations. Phys Chem Chem Phys 2020; 22:9759-9766. [PMID: 32334427 DOI: 10.1039/d0cp00389a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Phase-change materials such as Ge-Sb-Te compounds have attracted much attention due to their potential value in electrical data storage. In contrast to the amorphous and crystalline phases, supercooled liquids are far from being deeply understood despite their inevitable role in both amorphization and crystallization processes. To this end, we have studied the dynamics properties and structural characteristics of liquid and supercooled liquid Ge3Sb2Te6 during the fast cooling process. As the temperature decreases, chemical bonds become more homogeneous, but coordination numbers of Ge, Sb and Te atoms change very little. Meanwhile, the structural order of short-range configuration is obviously enhanced. Further studies suggest that Ge-centered, Sb-centered and Te-centered configurations change to the more ordered defective octahedrons mainly by adjusting the bond-angle relationship and bond length, rather than just by changing the coordination environment. It is the more ordered octahedrons that promote the formation of medium-range order. Our findings provide a deep insight into the origin of local structural order in supercooled liquid Ge3Sb2Te6, which is of great importance for the comprehensive understanding of amorphization and crystallization processes.
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Affiliation(s)
- Chong Qiao
- Shanghai Ultra-Precision Optical Manufacturing Engineering Center and Department of Optical Science and Engineering, Fudan University, Shanghai, 200433, China.
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12
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Behrens M, Lotnyk A, Gerlach JW, Ehrhardt M, Lorenz P, Rauschenbach B. Direct Measurement of Crystal Growth Velocity in Epitaxial Phase-Change Material Thin Films. ACS APPLIED MATERIALS & INTERFACES 2019; 11:41544-41550. [PMID: 31612702 DOI: 10.1021/acsami.9b16111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Central to the use of Ge-Sb-Te based phase-change materials for data storage applications is their crystallization capability since it determines memory writing time. Although being intensively studied to identify intrinsic limits and develop strategies to enhance memory performance, the crystallization process in these materials is still not fully explored. Therefore, this study focuses on the determination of crystal growth dynamics in an epitaxial phase-change material thin film model system offering the advantage of high crystalline quality and application-relevant sizing. By introducing a method that combines time-resolved reflectivity measurements with high-resolution scanning transmission electron microscopy, crystal growth velocities upon fast cooling after single ns-laser pulse irradiation of the prototypical phase-change material Ge2Sb2Te5 are determined. As a result, an increase in crystal growth velocity from 0.4 to 1.7 m/s with increasing laser fluence is observed with a maximum rate of 1.7 m/s as the upper detectable limit of the studied material.
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Affiliation(s)
- Mario Behrens
- Leibniz Institute of Surface Engineering (IOM) , Permoserstr. 15 , D-04318 Leipzig , Germany
| | - Andriy Lotnyk
- Leibniz Institute of Surface Engineering (IOM) , Permoserstr. 15 , D-04318 Leipzig , Germany
| | - Jürgen W Gerlach
- Leibniz Institute of Surface Engineering (IOM) , Permoserstr. 15 , D-04318 Leipzig , Germany
| | - Martin Ehrhardt
- Leibniz Institute of Surface Engineering (IOM) , Permoserstr. 15 , D-04318 Leipzig , Germany
| | - Pierre Lorenz
- Leibniz Institute of Surface Engineering (IOM) , Permoserstr. 15 , D-04318 Leipzig , Germany
| | - Bernd Rauschenbach
- Leibniz Institute of Surface Engineering (IOM) , Permoserstr. 15 , D-04318 Leipzig , Germany
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13
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Gabardi S, Sosso GG, Behler J, Bernasconi M. Priming effects in the crystallization of the phase change compound GeTe from atomistic simulations. Faraday Discuss 2019; 213:287-301. [PMID: 30379974 DOI: 10.1039/c8fd00101d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Strategies to reduce the incubation time for crystal nucleation and thus the stochasticity of the set process are of relevance for the operation of phase change memories in ultra-scaled geometries. With these premises, in this work we investigate the crystallization kinetics of the phase change compound GeTe. We have performed large scale molecular dynamics simulations using an interatomic potential, generated previously from a neural network fitting of a database of ab initio energies. We have addressed the crystallization of models of amorphous GeTe annealed at different temperatures above the glass transition. The results on the distribution of subcritical nuclei and on the crystal growth velocity of postcritical ones are compared with our previous simulations of the supercooled liquid quenched from the melt. We find that a large population of subcritical nuclei can form at the lower temperatures where the nucleation rate is large. This population partially survives upon fast annealing, which leads to a dramatic reduction of the incubation time at high temperatures where the crystal growth velocity is maximal. This priming effect could be exploited to enhance the speed of the set process in phase change memories.
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Affiliation(s)
- Silvia Gabardi
- Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, I-20125 Milano, Italy.
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14
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Xu M, Li B, Xu K, Tong H, Cheng X, Xu M, Miao X. Stabilizing amorphous Sb by adding alien seeds for durable memory materials. Phys Chem Chem Phys 2019; 21:4494-4500. [DOI: 10.1039/c8cp07446a] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We developed a doping strategy to improve the thermal stability of phase-change memory by adding alien tetrahedral seeds.
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Affiliation(s)
- Meng Xu
- Wuhan National Research Center for Optoelectronics
- School of Optical and Electronic Information
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Bowen Li
- Wuhan National Research Center for Optoelectronics
- School of Optical and Electronic Information
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Kailang Xu
- Wuhan National Research Center for Optoelectronics
- School of Optical and Electronic Information
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Hao Tong
- Wuhan National Research Center for Optoelectronics
- School of Optical and Electronic Information
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Xiaomin Cheng
- Wuhan National Research Center for Optoelectronics
- School of Optical and Electronic Information
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Ming Xu
- Wuhan National Research Center for Optoelectronics
- School of Optical and Electronic Information
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Xiangshui Miao
- Wuhan National Research Center for Optoelectronics
- School of Optical and Electronic Information
- Huazhong University of Science and Technology
- Wuhan 430074
- China
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15
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Sanari Y, Tachizaki T, Saito Y, Makino K, Fons P, Kolobov AV, Tominaga J, Tanaka K, Kanemitsu Y, Hase M, Hirori H. Zener Tunneling Breakdown in Phase-Change Materials Revealed by Intense Terahertz Pulses. PHYSICAL REVIEW LETTERS 2018; 121:165702. [PMID: 30387634 DOI: 10.1103/physrevlett.121.165702] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 06/29/2018] [Indexed: 06/08/2023]
Abstract
We have systematically investigated the spatial and temporal dynamics of crystallization that occur in the phase-change material Ge_{2}Sb_{2}Te_{5} upon irradiation with an intense terahertz (THz) pulse. THz-pump-optical-probe spectroscopy revealed that Zener tunneling induces a nonlinear increase in the conductivity of the crystalline phase. This fact causes the large enhancement of electric field associated with the THz pulses only at the edge of the crystallized area. The electric field concentrating in this area causes a temperature increase via Joule heating, which in turn leads to nanometer-scale crystal growth parallel to the field and the formation of filamentary conductive domains across the sample.
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Affiliation(s)
- Yasuyuki Sanari
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takehiro Tachizaki
- Department of Optics and Imaging Science and Technology, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Kyoto 606-8501, Japan
| | - Yuta Saito
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
| | - Kotaro Makino
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
| | - Paul Fons
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
| | - Alexander V Kolobov
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
| | - Junji Tominaga
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
| | - Koichiro Tanaka
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Kyoto 606-8501, Japan
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto, Kyoto 606-8502, Japan
| | - Yoshihiko Kanemitsu
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Muneaki Hase
- Division of Applied Physics, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8573, Japan
| | - Hideki Hirori
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Kyoto 606-8501, Japan
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16
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Mocanu FC, Konstantinou K, Lee TH, Bernstein N, Deringer VL, Csányi G, Elliott SR. Modeling the Phase-Change Memory Material, Ge2Sb2Te5, with a Machine-Learned Interatomic Potential. J Phys Chem B 2018; 122:8998-9006. [DOI: 10.1021/acs.jpcb.8b06476] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Felix C. Mocanu
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
- Engineering Laboratory, University of Cambridge, Cambridge CB2 1PZ, United Kingdom
| | | | - Tae Hoon Lee
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
| | - Noam Bernstein
- Center for Materials Physics and Technology, U.S. Naval Research Laboratory, Washington, District of Columbia 20375, United States
| | - Volker L. Deringer
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
- Engineering Laboratory, University of Cambridge, Cambridge CB2 1PZ, United Kingdom
| | - Gábor Csányi
- Engineering Laboratory, University of Cambridge, Cambridge CB2 1PZ, United Kingdom
| | - Stephen R. Elliott
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
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17
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Origin of radiation tolerance in amorphous Ge 2Sb 2Te 5 phase-change random-access memory material. Proc Natl Acad Sci U S A 2018; 115:5353-5358. [PMID: 29735691 DOI: 10.1073/pnas.1800638115] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The radiation hardness of amorphous Ge2Sb2Te5 phase-change random-access memory material has been elucidated by ab initio molecular-dynamics simulations. Ionizing radiation events have been modeled to investigate their effect on the atomic and electronic structure of the glass. Investigation of the short- and medium-range order highlights a structural recovery of the amorphous network after exposure to the high-energy events modeled in this study. Analysis of the modeled glasses reveals specific structural rearrangements in the local atomic geometry of the glass, as well as an increase in the formation of large shortest-path rings. The electronic structure of the modeled system is not significantly affected by the ionizing radiation events, since negligible differences have been observed before and after irradiation. These results provide a detailed insight into the atomistic structure of amorphous Ge2Sb2Te5 after irradiation and demonstrate the radiation hardness of the glass matrix.
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18
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Flores-Ruiz H, Micoulaut M. From elemental tellurium to Ge 2Sb 2Te 5 melts: High temperature dynamic and relaxation properties in relationship with the possible fragile to strong transition. J Chem Phys 2018; 148:034502. [PMID: 29352786 DOI: 10.1063/1.5013668] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigate the dynamic properties of Ge-Sb-Te phase change melts using first principles molecular dynamics with a special emphasis on the effect of tellurium composition on melt dynamics. From structural models and trajectories established previously [H. Flores-Ruiz et al., Phys. Rev. B 92, 134205 (2015)], we calculate the diffusion coefficients for the different species, the activation energies for diffusion, the Van Hove correlation, and the intermediate scattering functions able to substantiate the dynamics and relaxation behavior of the liquids as a function of temperature and composition that is also compared to experiment whenever possible. We find that the diffusion is mostly Arrhenius-like and that the addition of Ge/Sb atoms leads to a global decrease of the jump probability and to an increase in activated dynamics for diffusion. Relaxation behavior is analyzed and used in order to evaluate the possibility of a fragile to strong transition that is evidenced from the calculated high fragility (M = 129) of Ge2Sb2Te5 at high temperatures.
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Affiliation(s)
- H Flores-Ruiz
- Laboratoire de Physique Théorique de la Matière Condensée, Paris Sorbonne Universités - UPMC, Boite 121, 4, Place Jussieu, 75252 Paris Cedex 05, France
| | - M Micoulaut
- Laboratoire de Physique Théorique de la Matière Condensée, Paris Sorbonne Universités - UPMC, Boite 121, 4, Place Jussieu, 75252 Paris Cedex 05, France
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19
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20
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Gwon T, Mohamed AY, Yoo C, Park ES, Kim S, Yoo S, Lee HK, Cho DY, Hwang CS. Structural Analyses of Phase Stability in Amorphous and Partially Crystallized Ge-Rich GeTe Films Prepared by Atomic Layer Deposition. ACS APPLIED MATERIALS & INTERFACES 2017; 9:41387-41396. [PMID: 29111646 DOI: 10.1021/acsami.7b12946] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The local bonding structures of GexTe1-x (x = 0.5, 0.6, and 0.7) films prepared through atomic layer deposition (ALD) with Ge(N(Si(CH3)3)2)2 and ((CH3)3Si)2Te precursors were investigated using Ge K-edge X-ray absorption spectroscopy (XAS). The results of the X-ray absorption fine structure analyses show that for all of the compositions, the as-grown films were amorphous with a tetrahedral Ge coordination of a mixture of Ge-Te and Ge-Ge bonds but without any signature of Ge-GeTe decomposition. The compositional evolution in the valence band electronic structures probed through X-ray photoelectron spectroscopy suggests a substantial chemical influence of additional Ge on the nonstoichiometric GeTe. This implies that the ALD process can stabilize Ge-abundant bonding networks like -Te-Ge-Ge-Te- in amorphous GeTe. Meanwhile, the XAS results on the Ge-rich films that had undergone post-deposition annealing at 350 °C show that the parts of the crystalline Ge-rich GeTe became separated into Ge crystallites and rhombohedral GeTe in accordance with the bulk phase diagram, whereas the disordered GeTe domains still remained, consistent with the observations of transmission electron microscopy and Raman spectroscopy. Therefore, amorphousness in GeTe may be essential for the nonsegregated Ge-rich phases and the low growth temperature of the ALD enables the achievement of the structurally metastable phases.
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Affiliation(s)
- Taehong Gwon
- Department of Materials Science and Engineering, and Inter-University Semiconductor Research Center, Seoul National University , Seoul 08826, Republic of Korea
| | - Ahmed Yousef Mohamed
- IPIT & Department of Physics, Chonbuk National University , Jeonju 54896, Republic of Korea
| | - Chanyoung Yoo
- Department of Materials Science and Engineering, and Inter-University Semiconductor Research Center, Seoul National University , Seoul 08826, Republic of Korea
| | - Eui-Sang Park
- Department of Materials Science and Engineering, and Inter-University Semiconductor Research Center, Seoul National University , Seoul 08826, Republic of Korea
| | - Sanggyun Kim
- Department of Materials Science and Engineering, and Inter-University Semiconductor Research Center, Seoul National University , Seoul 08826, Republic of Korea
| | - Sijung Yoo
- Department of Materials Science and Engineering, and Inter-University Semiconductor Research Center, Seoul National University , Seoul 08826, Republic of Korea
| | - Han-Koo Lee
- Pohang Accelerator Laboratory , Pohang 37673, Republic of Korea
| | - Deok-Yong Cho
- IPIT & Department of Physics, Chonbuk National University , Jeonju 54896, Republic of Korea
| | - Cheol Seong Hwang
- Department of Materials Science and Engineering, and Inter-University Semiconductor Research Center, Seoul National University , Seoul 08826, Republic of Korea
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21
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Rao F, Ding K, Zhou Y, Zheng Y, Xia M, Lv S, Song Z, Feng S, Ronneberger I, Mazzarello R, Zhang W, Ma E. Reducing the stochasticity of crystal nucleation to enable subnanosecond memory writing. Science 2017; 358:1423-1427. [PMID: 29123020 DOI: 10.1126/science.aao3212] [Citation(s) in RCA: 132] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 10/30/2017] [Indexed: 01/26/2023]
Abstract
Operation speed is a key challenge in phase-change random-access memory (PCRAM) technology, especially for achieving subnanosecond high-speed cache memory. Commercialized PCRAM products are limited by the tens of nanoseconds writing speed, originating from the stochastic crystal nucleation during the crystallization of amorphous germanium antimony telluride (Ge2Sb2Te5). Here, we demonstrate an alloying strategy to speed up the crystallization kinetics. The scandium antimony telluride (Sc0.2Sb2Te3) compound that we designed allows a writing speed of only 700 picoseconds without preprogramming in a large conventional PCRAM device. This ultrafast crystallization stems from the reduced stochasticity of nucleation through geometrically matched and robust scandium telluride (ScTe) chemical bonds that stabilize crystal precursors in the amorphous state. Controlling nucleation through alloy design paves the way for the development of cache-type PCRAM technology to boost the working efficiency of computing systems.
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Affiliation(s)
- Feng Rao
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.,College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
| | - Keyuan Ding
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.,College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
| | - Yuxing Zhou
- Center for Advancing Materials Performance from the Nanoscale, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yonghui Zheng
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Mengjiao Xia
- International Laboratory of Quantum Functional Materials of Henan, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Shilong Lv
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Zhitang Song
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
| | - Songlin Feng
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Ider Ronneberger
- Institute for Theoretical Solid State Physics, JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen D-52074, Germany
| | - Riccardo Mazzarello
- Institute for Theoretical Solid State Physics, JARA-FIT and JARA-HPC, RWTH Aachen University, Aachen D-52074, Germany
| | - Wei Zhang
- Center for Advancing Materials Performance from the Nanoscale, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
| | - Evan Ma
- Center for Advancing Materials Performance from the Nanoscale, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.,Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
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22
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Wang JJ, Xu YZ, Mazzarello R, Wuttig M, Zhang W. A Review on Disorder-Driven Metal-Insulator Transition in Crystalline Vacancy-Rich GeSbTe Phase-Change Materials. MATERIALS 2017; 10:ma10080862. [PMID: 28773222 PMCID: PMC5578228 DOI: 10.3390/ma10080862] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 07/23/2017] [Accepted: 07/25/2017] [Indexed: 12/14/2022]
Abstract
Metal-insulator transition (MIT) is one of the most essential topics in condensed matter physics and materials science. The accompanied drastic change in electrical resistance can be exploited in electronic devices, such as data storage and memory technology. It is generally accepted that the underlying mechanism of most MITs is an interplay of electron correlation effects (Mott type) and disorder effects (Anderson type), and to disentangle the two effects is difficult. Recent progress on the crystalline Ge₁Sb₂Te₄ (GST) compound provides compelling evidence for a disorder-driven MIT. In this work, we discuss the presence of strong disorder in GST, and elucidate its effects on electron localization and transport properties. We also show how the degree of disorder in GST can be reduced via thermal annealing, triggering a disorder-driven metal-insulator transition. The resistance switching by disorder tuning in crystalline GST may enable novel multilevel data storage devices.
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Affiliation(s)
- Jiang-Jing Wang
- Center for Advancing Materials Performance from the Nanoscale, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Ya-Zhi Xu
- Center for Advancing Materials Performance from the Nanoscale, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Riccardo Mazzarello
- Institute for Theoretical Solid-State Physics, JARA-FIT and JARA-HPC, RWTH Aachen University, 52074 Aachen, Germany.
| | - Matthias Wuttig
- Institute of Physics IA, JARA-FIT and JARA-HPC, RWTH Aachen University, 52074 Aachen, Germany.
| | - Wei Zhang
- Center for Advancing Materials Performance from the Nanoscale, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
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23
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Song WX, Liu ZP, Liu LM. Inherent Simple Cubic Lattice Being Responsible for Ultrafast Solid-Phase Change of Ge 2Sb 2Te 5. J Phys Chem Lett 2017; 8:2560-2564. [PMID: 28535351 DOI: 10.1021/acs.jpclett.7b00913] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Crystallization of solid is generally slow in kinetics for atoms trapped in solids. Phase-change materials (PCMs) challenge current theory on its ultrafast reversible amorphous-to-crystal transition. Here by using the stochastic surface walking global optimization method, we establish the first global potential energy surface (PES) for Ge2Sb2Te5. By analyzing all structures on the global PES, we show that an inherent structural pattern of simple cubic lattice is present universally in low-energy structures, either globally in a newly found metastable simple cubic crystal phase or locally in the amorphous structures. Our solid-to-solid reaction pathway sampling reveals that this simple cubic lattice plays a critical role in the rapid amorphous-to-crystal transition, which occurs via dynamic vacancy creation/annihilation, Martensitic-type {100} shearing, and diffusionless local relaxation. This knowledge from global PES allows the prediction of PCMs by linking the phase-change kinetics with the geometry of metastable phases.
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Affiliation(s)
- Wen-Xiong Song
- Collaborative Innovation Center of Chemistry for Energy Material, Key Laboratory of Computational Physical Science (Ministry of Education), Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University , Shanghai 200433, China
- Beijing Computational Science Research Center , Beijing 100193, China
| | - Zhi-Pan Liu
- Collaborative Innovation Center of Chemistry for Energy Material, Key Laboratory of Computational Physical Science (Ministry of Education), Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University , Shanghai 200433, China
- Beijing Computational Science Research Center , Beijing 100193, China
| | - Li-Min Liu
- Beijing Computational Science Research Center , Beijing 100193, China
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24
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Lee TH, Elliott SR. The Relation between Chemical Bonding and Ultrafast Crystal Growth. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29. [PMID: 28417576 DOI: 10.1002/adma.201700814] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 03/07/2017] [Indexed: 05/09/2023]
Abstract
Glasses are often described as supercooled liquids, whose structures are topologically disordered like a liquid, but nevertheless retain short-range structural order. Structural complexity is often associated with complicated electron-charge distributions in glassy systems, making a detailed investigation challenging even for short-range structural order, let alone their atomic dynamics. This is particularly problematic for lone-pair-rich, semiconducting materials, such as phase-change materials (PCMs). Here, this study shows that analytical methods for studying bonding, based on the electron-charge density, rather than a conventional atomic pair-correlation-function approach, allows an in-depth investigation into the chemical-bonding network, as well as lone pairs, of the prototypical PCM, Ge2 Sb2 Te5 (GST). It is demonstrated that the structurally flexible building units of the amorphous GST network, intimately linked to the presence of distinctly coexisting weak covalent and lone-pair interactions, give rise to cooperative structural-ordering processes, by which ultrafast crystal growth becomes possible. This finding may universally apply to other PCMs.
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Affiliation(s)
- Tae Hoon Lee
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Stephen R Elliott
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
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25
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Zierenberg J, Schierz P, Janke W. Canonical free-energy barrier of particle and polymer cluster formation. Nat Commun 2017; 8:14546. [PMID: 28240262 PMCID: PMC5333364 DOI: 10.1038/ncomms14546] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 01/10/2017] [Indexed: 12/16/2022] Open
Abstract
A common approach to study nucleation rates is the estimation of free-energy barriers. This usually requires knowledge about the shape of the forming droplet, a task that becomes notoriously difficult in macromolecular setups starting with a proper definition of the cluster boundary. Here we demonstrate a shape-free determination of the free energy for temperature-driven cluster formation in particle as well as polymer systems. Combined with rigorous results on equilibrium droplet formation, this allows for a well-defined finite-size scaling analysis of the effective interfacial free energy at a fixed density. We first verify the theoretical predictions for the formation of a liquid droplet in a supersaturated particle gas by generalized-ensemble Monte Carlo simulations of a Lennard-Jones system. Going one step further, we then generalize this approach to cluster formation in a dilute polymer solution. Our results suggest an analogy with particle condensation, when the macromolecules are interpreted as extended particles.
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Affiliation(s)
- Johannes Zierenberg
- Institut für Theoretische Physik, Universität Leipzig, Postfach 100 920, D-04009 Leipzig, Germany
| | - Philipp Schierz
- Institut für Theoretische Physik, Universität Leipzig, Postfach 100 920, D-04009 Leipzig, Germany
| | - Wolfhard Janke
- Institut für Theoretische Physik, Universität Leipzig, Postfach 100 920, D-04009 Leipzig, Germany
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26
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Shukla KD, Saxena N, Durai S, Manivannan A. Redefining the Speed Limit of Phase Change Memory Revealed by Time-resolved Steep Threshold-Switching Dynamics of AgInSbTe Devices. Sci Rep 2016; 6:37868. [PMID: 27886266 PMCID: PMC5122954 DOI: 10.1038/srep37868] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Accepted: 10/28/2016] [Indexed: 11/10/2022] Open
Abstract
Although phase-change memory (PCM) offers promising features for a 'universal memory' owing to high-speed and non-volatility, achieving fast electrical switching remains a key challenge. In this work, a correlation between the rate of applied voltage and the dynamics of threshold-switching is investigated at picosecond-timescale. A distinct characteristic feature of enabling a rapid threshold-switching at a critical voltage known as the threshold voltage as validated by an instantaneous response of steep current rise from an amorphous off to on state is achieved within 250 picoseconds and this is followed by a slower current rise leading to crystallization. Also, we demonstrate that the extraordinary nature of threshold-switching dynamics in AgInSbTe cells is independent to the rate of applied voltage unlike other chalcogenide-based phase change materials exhibiting the voltage dependent transient switching characteristics. Furthermore, numerical solutions of time-dependent conduction process validate the experimental results, which reveal the electronic nature of threshold-switching. These findings of steep threshold-switching of 'sub-50 ps delay time', opens up a new way for achieving high-speed non-volatile memory for mainstream computing.
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Affiliation(s)
- Krishna Dayal Shukla
- Discipline of Electrical Engineering, Indian Institute of Technology Indore, Indore - 453552, India
| | - Nishant Saxena
- Discipline of Electrical Engineering, Indian Institute of Technology Indore, Indore - 453552, India
| | - Suresh Durai
- Discipline of Electrical Engineering, Indian Institute of Technology Indore, Indore - 453552, India
| | - Anbarasu Manivannan
- Discipline of Electrical Engineering, Indian Institute of Technology Indore, Indore - 453552, India.,Materials Science and Engineering, Indian Institute of Technology Indore, Indore - 453552, India
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27
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Bang J, Sun YY, Liu XQ, Gao F, Zhang SB. Carrier-Multiplication-Induced Structural Change during Ultrafast Carrier Relaxation and Nonthermal Phase Transition in Semiconductors. PHYSICAL REVIEW LETTERS 2016; 117:126402. [PMID: 27689286 DOI: 10.1103/physrevlett.117.126402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Indexed: 06/06/2023]
Abstract
While being extensively studied as an important physical process to alter exciton population in nanostructures at the fs time scale, carrier multiplication has not been considered seriously as a major mechanism for phase transition. Real-time time-dependent density functional theory study of Ge_{2}Sb_{2}Te_{5} reveals that carrier multiplication can induce an ultrafast phase transition in the solid state despite that the lattice remains cold. The results also unify the experimental findings in other semiconductors for which the explanation remains to be the 30-year old phenomenological plasma annealing model.
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Affiliation(s)
- Junhyeok Bang
- Department of Physics, Applied Physics, & Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
- Spin Engineering Physics Team, Korea Basic Science Institute (KBSI), Daejeon 305-806, Republic of Korea
| | - Y Y Sun
- Department of Physics, Applied Physics, & Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - X-Q Liu
- Department of Physics, Applied Physics, & Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - F Gao
- Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - S B Zhang
- Department of Physics, Applied Physics, & Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
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28
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Sosso G, Chen J, Cox SJ, Fitzner M, Pedevilla P, Zen A, Michaelides A. Crystal Nucleation in Liquids: Open Questions and Future Challenges in Molecular Dynamics Simulations. Chem Rev 2016; 116:7078-116. [PMID: 27228560 PMCID: PMC4919765 DOI: 10.1021/acs.chemrev.5b00744] [Citation(s) in RCA: 379] [Impact Index Per Article: 47.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Indexed: 11/28/2022]
Abstract
The nucleation of crystals in liquids is one of nature's most ubiquitous phenomena, playing an important role in areas such as climate change and the production of drugs. As the early stages of nucleation involve exceedingly small time and length scales, atomistic computer simulations can provide unique insights into the microscopic aspects of crystallization. In this review, we take stock of the numerous molecular dynamics simulations that, in the past few decades, have unraveled crucial aspects of crystal nucleation in liquids. We put into context the theoretical framework of classical nucleation theory and the state-of-the-art computational methods by reviewing simulations of such processes as ice nucleation and the crystallization of molecules in solutions. We shall see that molecular dynamics simulations have provided key insights into diverse nucleation scenarios, ranging from colloidal particles to natural gas hydrates, and that, as a result, the general applicability of classical nucleation theory has been repeatedly called into question. We have attempted to identify the most pressing open questions in the field. We believe that, by improving (i) existing interatomic potentials and (ii) currently available enhanced sampling methods, the community can move toward accurate investigations of realistic systems of practical interest, thus bringing simulations a step closer to experiments.
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Affiliation(s)
- Gabriele
C. Sosso
- Thomas Young Centre, London
Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street WC1E
6BT London, U.K.
| | - Ji Chen
- Thomas Young Centre, London
Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street WC1E
6BT London, U.K.
| | | | - Martin Fitzner
- Thomas Young Centre, London
Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street WC1E
6BT London, U.K.
| | - Philipp Pedevilla
- Thomas Young Centre, London
Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street WC1E
6BT London, U.K.
| | - Andrea Zen
- Thomas Young Centre, London
Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street WC1E
6BT London, U.K.
| | - Angelos Michaelides
- Thomas Young Centre, London
Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street WC1E
6BT London, U.K.
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29
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Competing covalent and ionic bonding in Ge-Sb-Te phase change materials. Sci Rep 2016; 6:25981. [PMID: 27193531 PMCID: PMC4872153 DOI: 10.1038/srep25981] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 04/22/2016] [Indexed: 12/27/2022] Open
Abstract
Ge2Sb2Te5 and related phase change materials are highly unusual in that they can be readily transformed between amorphous and crystalline states using very fast melt, quench, anneal cycles, although the resulting states are extremely long lived at ambient temperature. These states have remarkably different physical properties including very different optical constants in the visible in strong contrast to common glass formers such as silicates or phosphates. This behavior has been described in terms of resonant bonding, but puzzles remain, particularly regarding different physical properties of crystalline and amorphous phases. Here we show that there is a strong competition between ionic and covalent bonding in cubic phase providing a link between the chemical basis of phase change memory property and origins of giant responses of piezoelectric materials (PbTiO3, BiFeO3). This has important consequences for dynamical behavior in particular leading to a simultaneous hardening of acoustic modes and softening of high frequency optic modes in crystalline phase relative to amorphous. This different bonding in amorphous and crystalline phases provides a direct explanation for different physical properties and understanding of the combination of long time stability and rapid switching and may be useful in finding new phase change compositions with superior properties.
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30
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Mitrofanov KV, Fons P, Makino K, Terashima R, Shimada T, Kolobov AV, Tominaga J, Bragaglia V, Giussani A, Calarco R, Riechert H, Sato T, Katayama T, Ogawa K, Togashi T, Yabashi M, Wall S, Brewe D, Hase M. Sub-nanometre resolution of atomic motion during electronic excitation in phase-change materials. Sci Rep 2016; 6:20633. [PMID: 26868451 PMCID: PMC4751541 DOI: 10.1038/srep20633] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 01/06/2016] [Indexed: 12/13/2022] Open
Abstract
Phase-change materials based on Ge-Sb-Te alloys are widely used in industrial applications such as nonvolatile memories, but reaction pathways for crystalline-to-amorphous phase-change on picosecond timescales remain unknown. Femtosecond laser excitation and an ultrashort x-ray probe is used to show the temporal separation of electronic and thermal effects in a long-lived (>100 ps) transient metastable state of Ge2Sb2Te5 with muted interatomic interaction induced by a weakening of resonant bonding. Due to a specific electronic state, the lattice undergoes a reversible nondestructive modification over a nanoscale region, remaining cold for 4 ps. An independent time-resolved x-ray absorption fine structure experiment confirms the existence of an intermediate state with disordered bonds. This newly unveiled effect allows the utilization of non-thermal ultra-fast pathways enabling artificial manipulation of the switching process, ultimately leading to a redefined speed limit, and improved energy efficiency and reliability of phase-change memory technologies.
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Affiliation(s)
- Kirill V Mitrofanov
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science &Technology (AIST), Tsukuba Central 5, Higashi 1-1-1,Tsukuba 305-8562, Japan.,RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5148, Japan
| | - Paul Fons
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science &Technology (AIST), Tsukuba Central 5, Higashi 1-1-1,Tsukuba 305-8562, Japan.,RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5148, Japan.,Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5198, Japan
| | - Kotaro Makino
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science &Technology (AIST), Tsukuba Central 5, Higashi 1-1-1,Tsukuba 305-8562, Japan
| | - Ryo Terashima
- Division of Applied Physics, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8573, Japan
| | - Toru Shimada
- Department of Science, Faculty of Education, Hirosaki University, 1 Bunkyo-cho, Hirosaki, Aomori 036-8560, Japan
| | - Alexander V Kolobov
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science &Technology (AIST), Tsukuba Central 5, Higashi 1-1-1,Tsukuba 305-8562, Japan.,Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5198, Japan
| | - Junji Tominaga
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science &Technology (AIST), Tsukuba Central 5, Higashi 1-1-1,Tsukuba 305-8562, Japan
| | - Valeria Bragaglia
- Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany
| | - Alessandro Giussani
- Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany
| | - Raffaella Calarco
- Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany
| | - Henning Riechert
- Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany
| | - Takahiro Sato
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5148, Japan
| | - Tetsuo Katayama
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5198, Japan
| | - Kanade Ogawa
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5148, Japan
| | - Tadashi Togashi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5198, Japan
| | - Makina Yabashi
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5148, Japan
| | - Simon Wall
- ICFO - Institut de Ciències Fot òniques, The Barcelona Institute of Science and Technology, 08860, Castelldefels, Barcelona, Spain
| | - Dale Brewe
- X-ray Science Division, Argonne National Laboratory, 9700 S. Cass Ave, Lemont, IL 60439, USA
| | - Muneaki Hase
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science &Technology (AIST), Tsukuba Central 5, Higashi 1-1-1,Tsukuba 305-8562, Japan.,Division of Applied Physics, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8573, Japan.,RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5148, Japan
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31
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Skelton JM, Tiana D, Parker SC, Togo A, Tanaka I, Walsh A. Influence of the exchange-correlation functional on the quasi-harmonic lattice dynamics of II-VI semiconductors. J Chem Phys 2015; 143:064710. [PMID: 26277159 DOI: 10.1063/1.4928058] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We perform a systematic comparison of the finite-temperature structure and properties of four bulk semiconductors (PbS, PbTe, ZnS, and ZnTe) predicted by eight popular exchange-correlation functionals from quasi-harmonic lattice-dynamics calculations. The performance of the functionals in reproducing the temperature dependence of a number of material properties, including lattice parameters, thermal-expansion coefficients, bulk moduli, heat capacities, and phonon frequencies, is evaluated quantitatively against available experimental data. We find that the phenomenological over- and under-binding characteristics of the local-density approximation and the PW91 and Perdew-Burke-Enzerhof (PBE) generalised-gradient approximation (GGA) functionals, respectively, are exaggerated at finite temperature, whereas the PBEsol GGA shows good general performance across all four systems. The Tao-Perdew-Staroverov-Scuseria (TPSS) and revTPSS meta-GGAs provide relatively small improvements over PBE, with the latter being better suited to calculating structural and dynamical properties, but both are considerably more computationally demanding than the simpler GGAs. The dispersion-corrected PBE-D2 and PBE-D3 functionals perform well in describing the lattice dynamics of the zinc chalcogenides, whereas the lead chalcogenides appear to be challenging for these functionals. These findings show that quasi-harmonic calculations with a suitable functional can predict finite-temperature structure and properties with useful accuracy, and that this technique can serve as a means of evaluating the performance of new functionals in the future.
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Affiliation(s)
- Jonathan M Skelton
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Davide Tiana
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Stephen C Parker
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Atsushi Togo
- Elements Strategy Initiative for Structural Materials, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Isao Tanaka
- Elements Strategy Initiative for Structural Materials, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Aron Walsh
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
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32
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Lee TH, Loke D, Elliott SR. Microscopic Mechanism of Doping-Induced Kinetically Constrained Crystallization in Phase-Change Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:5477-5483. [PMID: 26426723 DOI: 10.1002/adma.201502295] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 07/16/2015] [Indexed: 06/05/2023]
Abstract
A comprehensive microscopic mechanism of doping-induced kinetically constrained crystallization in phase-change materials is provided by investigating structural and dynamical dopant characteristics via ab initio molecular dynamics simulations. The information gained from this study may provide a basis for a fast screening of dopant species for electronic memory devices, or for understanding the general physics involved in the crystallization of doped glasses.
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Affiliation(s)
- Tae Hoon Lee
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Desmond Loke
- Department of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372, Singapore
| | - Stephen R Elliott
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
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33
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Skelton JM, Loke D, Lee T, Elliott SR. Ab Initio Molecular-Dynamics Simulation of Neuromorphic Computing in Phase-Change Memory Materials. ACS APPLIED MATERIALS & INTERFACES 2015; 7:14223-14230. [PMID: 26040531 DOI: 10.1021/acsami.5b01825] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present an in silico study of the neuromorphic-computing behavior of the prototypical phase-change material, Ge2Sb2Te5, using ab initio molecular-dynamics simulations. Stepwise changes in structural order in response to temperature pulses of varying length and duration are observed, and a good reproduction of the spike-timing-dependent plasticity observed in nanoelectronic synapses is demonstrated. Short above-melting pulses lead to instantaneous loss of structural and chemical order, followed by delayed partial recovery upon structural relaxation. We also investigate the link between structural order and electrical and optical properties. These results pave the way toward a first-principles understanding of phase-change physics beyond binary switching.
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Affiliation(s)
- Jonathan M Skelton
- †Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Desmond Loke
- †Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
- ‡Department of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
| | - Taehoon Lee
- †Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Stephen R Elliott
- †Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
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34
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Zhu M, Xia M, Song Z, Cheng Y, Wu L, Rao F, Song S, Wang M, Lu Y, Feng S. Understanding the crystallization behavior of as-deposited Ti-Sb-Te alloys through real-time radial distribution functions. NANOSCALE 2015; 7:9935-9944. [PMID: 25970803 DOI: 10.1039/c4nr07408d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Phase change materials, successfully used in optical data-storage and non-volatile electronic memory, are well-known for their ultrafast crystallization speed. However, the fundamental understanding of their crystallization behavior, especially the nucleation process, is limited by present experimental techniques. Here, real-time radial distribution functions (RDFs), derived from the selected area electron diffractions, are employed as structural probes to comprehensively study both nucleation and subsequent growth stages of Ti-doped Sb2Te3 (TST) materials in the electron-irradiation crystallization process. It can be found that the incorporation of Ti atoms in Sb2Te3 forms wrong bonds such as Ti-Te, Ti-Sb, breaks the originally ordered atomic arrangement and diminishes the initial nucleus size of the as-deposited films, which results in better thermal stability. But these nuclei hardly grow until their sizes exceed a critical value, and then a rapid growth period starts. This means that an extended nucleation time is required to form the supercritical nuclei of TST alloys with higher concentration. Also, the increasing formation of four-membered rings, which served as nucleation sites, after doping excessive Ti is responsible for the change of the crystallization behavior from growth-dominated to nucleation-dominated.
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Affiliation(s)
- Min Zhu
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
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35
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Zhang W, Zheng WT, Kim JG, Cui XQ, Li L, Qi JG, Kim YJ, Song SA. How important is the {103} plane of stable Ge2 Sb2 Te5 for phase-change memory? J Microsc 2015; 259:10-5. [PMID: 25809085 DOI: 10.1111/jmi.12242] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 02/07/2015] [Indexed: 11/30/2022]
Abstract
Closely correlating with {200} plane of cubic phase, {103} plane of hexagonal phase of Ge(2)Sb(2)Te(5) plays a crucial role in achieving fast phase change process as well as formation of modulation structures, dislocations and twins in Ge(2)Sb(2)Te(5). The behaviors of {103} plane of hexagonal phase render the phase-change memory process as a nanoscale shape memory.
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Affiliation(s)
- W Zhang
- Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Superhard Materials, Jilin University, Changchun, China.,Computational and Analytical Science Center, Samsung Advanced Institute of Technology, Yongin, South Korea
| | - W T Zheng
- Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Superhard Materials, Jilin University, Changchun, China
| | - J-G Kim
- Korea Basic Science Institute, Daejeon, South Korea
| | - X Q Cui
- Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Superhard Materials, Jilin University, Changchun, China
| | - L Li
- School of Electronic and Information Engineering, Changchun University, Changchun, China
| | - J G Qi
- School of Material Science & Engineering, Liaoning University of Technology, Jinzhou, China
| | - Y-J Kim
- Korea Basic Science Institute, Daejeon, South Korea
| | - S A Song
- Dongjin Semichem Co. Ltd., Hwaseong, South Korea.,Computational and Analytical Science Center, Samsung Advanced Institute of Technology, Yongin, South Korea
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36
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Zhang W, Ronneberger I, Zalden P, Xu M, Salinga M, Wuttig M, Mazzarello R. How fragility makes phase-change data storage robust: insights from ab initio simulations. Sci Rep 2014; 4:6529. [PMID: 25284316 PMCID: PMC4185410 DOI: 10.1038/srep06529] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 09/15/2014] [Indexed: 11/24/2022] Open
Abstract
Phase-change materials are technologically important due to their manifold applications in data storage. Here we report on ab initio molecular dynamics simulations of crystallization of the phase change material Ag4In3Sb67Te26 (AIST). We show that, at high temperature, the observed crystal growth mechanisms and crystallization speed are in good agreement with experimental data. We provide an in-depth understanding of the crystallization mechanisms at the atomic level. At temperatures below 550 K, the computed growth velocities are much higher than those obtained from time-resolved reflectivity measurements, due to large deviations in the diffusion coefficients. As a consequence of the high fragility of AIST, experimental diffusivities display a dramatic increase in activation energies and prefactors at temperatures below 550 K. This property is essential to ensure fast crystallization at high temperature and a stable amorphous state at low temperature. On the other hand, no such change in the temperature dependence of the diffusivity is observed in our simulations, down to 450 K. We also attribute this different behavior to the fragility of the system, in combination with the very fast quenching times employed in the simulations.
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Affiliation(s)
- Wei Zhang
- 1] Institute for Theoretical Solid State Physics, RWTH Aachen University, 52056 Aachen, Germany [2] I. Physikalisches Institut (IA), RWTH Aachen University, 52056 Aachen, Germany
| | - Ider Ronneberger
- Institute for Theoretical Solid State Physics, RWTH Aachen University, 52056 Aachen, Germany
| | - Peter Zalden
- 1] I. Physikalisches Institut (IA), RWTH Aachen University, 52056 Aachen, Germany [2] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Ming Xu
- I. Physikalisches Institut (IA), RWTH Aachen University, 52056 Aachen, Germany
| | - Martin Salinga
- I. Physikalisches Institut (IA), RWTH Aachen University, 52056 Aachen, Germany
| | - Matthias Wuttig
- 1] I. Physikalisches Institut (IA), RWTH Aachen University, 52056 Aachen, Germany [2] JARA-FIT and JARA-HPC, RWTH Aachen University, 52056 Aachen, Germany
| | - Riccardo Mazzarello
- 1] Institute for Theoretical Solid State Physics, RWTH Aachen University, 52056 Aachen, Germany [2] JARA-FIT and JARA-HPC, RWTH Aachen University, 52056 Aachen, Germany
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37
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Sosso GC, Miceli G, Caravati S, Giberti F, Behler J, Bernasconi M. Fast Crystallization of the Phase Change Compound GeTe by Large-Scale Molecular Dynamics Simulations. J Phys Chem Lett 2013; 4:4241-4246. [PMID: 26296172 DOI: 10.1021/jz402268v] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Phase change materials are of great interest as active layers in rewritable optical disks and novel electronic nonvolatile memories. These applications rest on a fast and reversible transformation between the amorphous and crystalline phases upon heating, taking place on the nanosecond time scale. In this work, we investigate the microscopic origin of the fast crystallization process by means of large-scale molecular dynamics simulations of the phase change compound GeTe. To this end, we use an interatomic potential generated from a Neural Network fitting of a large database of ab initio energies. We demonstrate that in the temperature range of the programming protocols of the electronic memories (500-700 K), nucleation of the crystal in the supercooled liquid is not rate-limiting. In this temperature range, the growth of supercritical nuclei is very fast because of a large atomic mobility, which is, in turn, the consequence of the high fragility of the supercooled liquid and the associated breakdown of the Stokes-Einstein relation between viscosity and diffusivity.
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Affiliation(s)
- Gabriele C Sosso
- †Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 53, I-20125 Milano, Italy
- ‡Department of Chemistry and Applied Biosciences and Facoltà di Informatica, ETH Zurich and Università della Svizzera Italiana, Istituto di Scienze Computazionali, Via G. Buffi 13, CH-6900 Lugano, Switzerland
| | - Giacomo Miceli
- ¶Chaire de Simulation à l'Echelle Atomique (CSEA), Ecole Polytechnique Fèdèrale de Lausanne (EPFL), PH H2 482 Station 3, CH-1015 Lausanne, Switzerland
| | - Sebastiano Caravati
- †Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 53, I-20125 Milano, Italy
| | - Federico Giberti
- ‡Department of Chemistry and Applied Biosciences and Facoltà di Informatica, ETH Zurich and Università della Svizzera Italiana, Istituto di Scienze Computazionali, Via G. Buffi 13, CH-6900 Lugano, Switzerland
| | - Jörg Behler
- §Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, Universitätstrasse 150, D-44780 Bochum, Germany
| | - Marco Bernasconi
- †Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 53, I-20125 Milano, Italy
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38
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Skelton JM, Elliott SR. In silico optimization of phase-change materials for digital memories: a survey of first-row transition-metal dopants for Ge₂Sb₂Te₅. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:205801. [PMID: 23628772 DOI: 10.1088/0953-8984/25/20/205801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Phase-change materials are the alloys at the heart of an emerging class of next-generation, non-volatile digital memory technologies. However, the widely studied Ge-Sb-Te system possesses several undesirable properties, and enhancing its properties, e.g. by doping, is an area of active research. Various first-row transition-metal dopants have been shown to impart useful property enhancements, but a systematic study of the entire period has yet to be undertaken, and little has been done to investigate their interaction with the host material at the atomic level. We have carried out first-principles computer simulations of the complete phase-change cycle in Ge2Sb2Te5 doped with each of the ten first-row transition metals. In this article, we present a comprehensive survey of the electronic, magnetic and optical properties of these doped materials. We discuss in detail their atomic-level structure, and relate the microscopic behaviours of the dopant atoms to their influence on the Ge2Sb2Te5 host. By considering an entire family of similar materials, we identify trends and patterns which might be used to predict suitable dopants for optimizing materials for specific phase-change applications. The computational method employed here is general, and this materials-discovery approach could be applied in the future to study other families of potential dopants for such materials.
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Affiliation(s)
- J M Skelton
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
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39
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Kalikka J, Akola J, Jones RO. Density functional simulations of structure and polymorphism in Ga/Sb films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:115801. [PMID: 23423720 DOI: 10.1088/0953-8984/25/11/115801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Thin films of gallium/antimony alloys are promising candidates for phase change memories requiring rapid crystallization at high crystallization temperatures. Prominent examples are the stoichiometric form GaSb and alloys near the eutectic composition GaSb(7), but little is known about their amorphous structures or the differences between the 'as-deposited' (AD) and 'melt-quenched' (MQ) forms. We have generated these structures using 528-atom density functional/molecular dynamics simulations, and we have studied in detail and compared structural parameters (pair distribution functions, structure factors, coordination numbers, bond and ring size distributions) and electronic properties (densities of states, bond orders) for all structures. There is good agreement with x-ray diffraction data from deposited films of GaSb, and there is evidence for Sb segregation in GaSb(7).
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Affiliation(s)
- J Kalikka
- Nanoscience Center, Department of Physics, University of Jyväskylä, Jyväskylä, Finland
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40
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Zhang W, Ronneberger I, Li Y, Mazzarello R. Magnetic properties of crystalline and amorphous phase-change materials doped with 3d impurities. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:4387-4391. [PMID: 22753225 DOI: 10.1002/adma.201201507] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2012] [Indexed: 06/01/2023]
Abstract
First-principles study of the structural and magnetic properties of cubic and amorphous phase-change materials doped with 3d impurities. We find that Co- and Ni-doped Ge(2) Sb(2) Te(5) is non-magnetic, whereas Cr- and Mn-doped Ge(2) Sb(2) Te(5) is magnetic and exhibits a significant magnetic contrast between the two phases in the ferromagnetic configuration. These results are explained in terms of differences in local structure and hybridization of the impurity d-orbitals with the host states.
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Affiliation(s)
- Wei Zhang
- Institute for Theoretical Solid State Physics and JARA, RWTH Aachen University, D-52056 Aachen, Germany
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41
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Loke D, Lee TH, Wang WJ, Shi LP, Zhao R, Yeo YC, Chong TC, Elliott SR. Breaking the speed limits of phase-change memory. Science 2012; 336:1566-9. [PMID: 22723419 DOI: 10.1126/science.1221561] [Citation(s) in RCA: 194] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Phase-change random-access memory (PCRAM) is one of the leading candidates for next-generation data-storage devices, but the trade-off between crystallization (writing) speed and amorphous-phase stability (data retention) presents a key challenge. We control the crystallization kinetics of a phase-change material by applying a constant low voltage via prestructural ordering (incubation) effects. A crystallization speed of 500 picoseconds was achieved, as well as high-speed reversible switching using 500-picosecond pulses. Ab initio molecular dynamics simulations reveal the phase-change kinetics in PCRAM devices and the structural origin of the incubation-assisted increase in crystallization speed. This paves the way for achieving a broadly applicable memory device, capable of nonvolatile operations beyond gigahertz data-transfer rates.
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Affiliation(s)
- D Loke
- Data Storage Institute, Agency for Science, Technology and Research (A*STAR), Singapore
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43
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Park SJ, Jang MH, Park SJ, Ahn M, Park DB, Ko DH, Cho MH. Effect of amorphization on the structural stability and reversibility of Ge2Sb2Te5 and oxygen incorporated Ge2Sb2Te5 films. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31764h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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