The impact of W doping on the phase change behavior of Sb2Te3

W doping is proposed to reduce the grain size of Sb2Te3. The grain size of W0.08(Sb2Te3)0.92 is about 5 nm, which is smaller than that of Sb2Te3 (∼80 nm) under the same annealing condition. The phase change memory based on W0.08(Sb2Te3)0.92 material shows 10 ns operation speed, 6 ns Set operation sp...

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Bibliographic Details
Published in:Journal of alloys and compounds 2016-12, Vol.688, p.22-26
Main Authors: Ding, Keyuan, Rao, Feng, Xia, Mengjiao, Song, Zhitang, Wu, Liangcai, Feng, Songlin
Format: Article
Language:English
Subjects:
Ab initio calculations
Phase change memory
Sb2Te3
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Summary:W doping is proposed to reduce the grain size of Sb2Te3. The grain size of W0.08(Sb2Te3)0.92 is about 5 nm, which is smaller than that of Sb2Te3 (∼80 nm) under the same annealing condition. The phase change memory based on W0.08(Sb2Te3)0.92 material shows 10 ns operation speed, 6 ns Set operation speed, and 1.3 × 105 reversible phase change ability. Through experimental and theoretical investigation, the W atoms are suggested to be located at the Sb positions, and bind with the Te atoms. The stronger WTe bonds induce the small grain size of W0.08(Sb2Te3)0.92, leading to high speed phase change ability. •W0.08(Sb2Te3)0.92 shows 10 ns operation speed, 6 ns Set operation speed.•The W atoms are suggested to locate in the Sb positions.•The grain size of W0.08(Sb2Te3)0.92 is about 5 nm.•The stronger WTe bonds induces the small grain size of W0.08(Sb2Te3)0.92.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.07.186