Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (1): 76-81.doi: 10.1007/s40242-016-5345-x

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Amorphous Structure and Bonding Chemistry of Aluminium Antimonide(AlSb) Alloy for Phase-change Memory Device

SUN Yu1, WANG Xuepeng1, DU Jiaren1, CHEN Nianke1, YU Hongmei2, WU Qi2, MENG Xing3   

  1. 1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering;
    2. College of Computer Science and Technology, Changchun 130012, P. R. China;
    3. College of Physics, Jilin University, Changchun 130012, P. R. China
  • Received:2015-09-02 Revised:2015-09-28 Online:2016-02-01 Published:2015-11-23
  • Contact: WANG Xuepeng, YU Hongmei E-mail:wangxpjlu@foxmail.com;hmyu@jlu.edu.cn
  • Supported by:

    Supported by the China Postdoctoral Science Foundation(No.2013T60315) and the National Natural Science Foundation of China(No.11374119).

Abstract:

With the help of first-principles molecular dynamics calculations, we obtained the atomic picture of amorphous AlSb(a-AlSb) for phase-change memory application. Generally, a-AlSb shows sp3 bonding network, which is the intrinsic characteristic for its good thermal stability. Significant wrong(homogenous) Al-Al bonds can also be observed from the pair correlation function. This hints the amorphous phase may consist of Al cluster and Sb-rich Al-Sb alloy. Recent experiment has observed the Sb-rich region of AlSb alloy can be switched to crystal, on the basis of which, combined with our calculations, we thus propose that on the one hand such a Sb-rich region in a-AlSb can retain the rapid crystallization like pure Sb solid and on the other hand some Al atoms play the important role of stabilizing Sb rich network with sp3 bonding. The present study offers a microscopic view to understand the phase change mechanism of AlSb alloy for information storage device.

Key words: AlSb alloy, Amorphous phase, Phase-change memory device, Ab initio calculation