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Effect of surface cleaning on contact resistivity of amorphous GeCu2Te3 to a W electrode

Published online by Cambridge University Press:  03 May 2016

S. Shindo ,
Y. Sutou ,
J. Koike ,
Y. Saito  and
Y.-H. Song
S. Shindo
Affiliation:
Department of Materials Science, Tohoku University, 6-6-11 Aoba-yama, Aoba-ku, Sendai 980-8579, Japan
Y. Sutou*
Affiliation:
Department of Materials Science, Tohoku University, 6-6-11 Aoba-yama, Aoba-ku, Sendai 980-8579, Japan
J. Koike
Affiliation:
Department of Materials Science, Tohoku University, 6-6-11 Aoba-yama, Aoba-ku, Sendai 980-8579, Japan
Y. Saito
Affiliation:
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
Y.-H. Song
Affiliation:
Department of Electronic Engineering, Hanyang University, Seoul 133-791, Korea
*
*(Email: ysutou@material.tohoku.ac.jp)
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Abstract

The contact resistivity, ρ c, between phase change material (PCM) and an electrode plays an important role in the operation of highly scaled phase change random access memory (PCRAM). We investigated the effect of surface cleaning on the ρ c between a W electrode and amorphous GeCu2Te3 (GCT) which shows high thermal stability. The surface cleaning of the amorphous GCT was conducted by Ar reverse sputtering. The ρ c of the amorphous GCT whose surface was cleaned with Ar reverse sputtering was 6.7×10-3Ω cm2. Meanwhile, the ρ c of the amorphous GCT with no surface cleaning was 8.0×10-5Ω cm2. The low ρ c in the amorphous GCT with no surface cleaning was apparently due to the existence of a low resistance Cu-rich underlayer which was formed as a consequence of surface oxidation of the amorphous GCT. These results indicate that the surface of a PCM must be treated carefully to accurately measure the contact resistivity between the PCM and electrodes.

Keywords

memoryamorphousoxidation
Type
Articles
Information
MRS Advances , Volume 1 , Issue 39: Materials Design , 2016 , pp. 2731 - 2736
Copyright
Copyright © Materials Research Society 2016 

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