Microstructure evolution of the phase change material TiSbTe

Yongjin Chen; Bin Zhang; Qingqing Ding; Qingsong Deng; Yan Cheng; Zhitang Song; Jixue Li; Ze Zhang; Xiaodong Han

doi:10.1117/12.2245016

12 October 2016 Microstructure evolution of the phase change material TiSbTe

Yongjin Chen, Bin Zhang, Qingqing Ding, Qingsong Deng, Yan Cheng, Zhitang Song, Jixue Li, Ze Zhang, Xiaodong Han

Proceedings Volume 9818, 2016 International Workshop on Information Data Storage and Tenth International Symposium on Optical Storage; 98180B (2016) https://doi.org/10.1117/12.2245016
Event: 2016 International Workshop on Information Data Storage and Tenth International Symposium on Optical Storage, 2016, Changzhou, China

Abstract

The crystallization process and crystal structure of the phase change material TiSbTe alloy have been successfully established, which is essential for applying this alloy in phase change memory. Specifically, transmission electron microscopy (TEM) analyses of the film annealed in situ were used in combination with selected-area electron diffraction (SAED) and radial distribution function (RDF) analyses to investigate the structural evolution from the amorphous phase to the polycrystalline phase. Moreover, the presence of structures with medium-range order in amorphous TST, which is beneficial to high-speed crystallization, was indicated by the structure factors S(Q)s. The crystallization temperature was determined to be approximately 170°C, and the grain size varied from several to dozens of nanometers. As the temperature increased, particularly above 200°C, the first single peak of the rG(r) curves transformed into double shoulder peaks due to the increasing impact of the Ti–Te bonds. In general, the majority of Ti atoms enter the SbTe lattice, whereas the remainder of the Ti atoms aggregate, leading to the appearance of TiTe₂ phase separation, as confirmed by the SAED patterns, high-angle annular dark field scanning transmission electron microscopy (HAADFSTEM) images and the corresponding energy-dispersive X-ray (EDX) mappings.

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Yongjin Chen, Bin Zhang, Qingqing Ding, Qingsong Deng, Yan Cheng, Zhitang Song, Jixue Li, Ze Zhang, and Xiaodong Han "Microstructure evolution of the phase change material TiSbTe", Proc. SPIE 9818, 2016 International Workshop on Information Data Storage and Tenth International Symposium on Optical Storage, 98180B (12 October 2016); https://doi.org/10.1117/12.2245016

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KEYWORDS

Crystals

Chemical species

Transmission electron microscopy

Annealing

Diffraction

Data storage

Crystallography

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