scholarly journals Comments on the electronic transport mechanisms in the crystalline state of Ge—Sb—Te phase-change materials

2021 ◽  
Vol 2 (2) ◽  
pp. 74-80
Author(s):  
Koichi Shimakawa ◽  
Ruben Jeronimo Freitas
2006 ◽  
Vol 918 ◽  
Author(s):  
Matthias Wuttig ◽  
Wojciech Welnic ◽  
Ralf Detemple ◽  
Henning Dieker ◽  
Johannes Kalb ◽  
...  

AbstractPhase change materials possess a unique combination of properties which include a pronounced property contrast between the amorphous and crystalline state, i.e. a high electrical and optical contrast. In particular the latter observation is indicative for a considerable structural difference between the amorphous and crystalline state. At the same time the crystallization of the amorphous state proceeds on a fast time scale. This raises the question how structure, properties and kinetics are related in phase change alloys. It will be demonstrated that only a small group of covalent semiconductors with octahedral-like coordination has the required property combination. This is related to their thermodynamic properties which govern the kinetics of crystallization.


2007 ◽  
Vol 22 (9) ◽  
pp. 2368-2375 ◽  
Author(s):  
Wojciech Wełnic ◽  
Johannes A. Kalb ◽  
Daniel Wamwangi ◽  
Christoph Steimer ◽  
Matthias Wuttig

Phase change materials possess a unique combination of properties, which includes a pronounced property contrast between the amorphous and crystalline state, i.e., high electrical and optical contrast. In particular, the latter observation is indicative of a considerable structural difference between the amorphous and crystalline state, which furthermore is characterized by a very high vacancy concentration unknown from common semiconductors. Through the use of ab initio calculations, this work shows how the electric and optical contrast is correlated with structural differences between the crystalline and the amorphous state and how the vacancy concentration controls the optical properties. Furthermore, crystal nucleation rates and crystal growth velocities of various phase change materials have been determined by atomic force microscopy and differential thermal analysis. In particular, the observation of different recrystallization mechanisms upon laser heating of amorphous marks is explained by the relative difference of just three basic parameters among these alloys, namely, the melt-crystalline interfacial energy, the entropy of fusion, and the glass transition temperature.


Author(s):  
Meng Xu ◽  
Rongchuan Gu ◽  
Chong Qiao ◽  
Hao Tong ◽  
Xiaomin Cheng ◽  
...  

Sb-based phase-change materials have exhibited tremendous advantages in both data storage and reconfigurable photonic devices. Despite of intensive studies on their structures and properties in the crystalline state, the widely-used...


Author(s):  
S.S. Kruglov (Jr.) ◽  
◽  
G.L. Patashnikov ◽  
S.S. Kruglov (Sr.) ◽  
◽  
...  

Author(s):  
M. A. Boda ◽  
◽  
R. V. Phand ◽  
A. C. Kotali ◽  
◽  
...  

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