期刊
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
卷 13, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201800562
关键词
chalcogenide superlattices; crystal structure; phase change memory; transmission electron microscopy; van der Waals gap
资金
- EU within the FP7 project PASTRY [GA 317746]
Phase-change materials (PCMs) based on Ge-Sb-Te alloys are a strong contender for next-generation memory technology. Recently, PCMs in the form of GeTe-Sb2Te3 superlattices (CSLs) have shown superior performance compared to ordinary PCM memory, which relies on switching between amorphous and crystalline phases. Although detailed atomic structure switching models have been developed with the help of ab-initio simulations, there is still fierce scientific debate concerning the experimental verification of the actual crystal structures pertaining to the two CSL memory states. One of the strongest techniques to provide this information is (scanning) transmission electron microscopy ((S)TEM). The present article reviews the analyses of CSLs using TEM-based techniques published during the last seven years since the seminal 2011 Nature Nanotechnology paper of Simpson et al., showing the superior performance of the CSL memory. It is critically reviewed what relevant information can be extracted from the (S)TEM results, also showing the impressive progress that has been achieved in a relatively short time frame. Finally, an outlook is given including several open questions. Although debate on actual switching mechanism in CSL memory is clearly not settled, still there is consensus in this field that CSL research has a bright future.
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