Related Experiment Video
Updated: Mar 15, 2026
11:07
Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
Published on: August 15, 2015
10.5K
Yttrium-Doped Sb2Te3: A Promising Material for Phase-Change Memory
Zhen Li1, Chen Si1, Jian Zhou1
1School of Materials Science and Engineering and ‡Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University , Beijing 100191, China.
ACS Applied Materials & Interfaces
|September 10, 2016
Summary
Yttrium doping enhances antimony telluride (Sb2Te3) for phase-change memory by increasing resistivity and thermal stability. This approach overcomes phase separation issues, improving material reliability for advanced electronic applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Materials Science
Background:
- Antimony telluride (Sb2Te3) is a promising material for phase-change memory devices.
- Low electrical resistivity and poor thermal stability limit Sb2Te3's practical applications.
- Existing dopants often lead to phase separation, reducing device reliability.
Purpose of the Study:
- To identify an optimal dopant for Sb2Te3 that enhances performance without causing phase separation.
- To investigate the effects of yttrium (Y) doping on Sb2Te3's properties.
- To improve the resistivity and thermal stability of Sb2Te3 for phase-change memory.
Main Methods:
- Ab initio calculations to identify optimal dopants and understand doping mechanisms.
- Ab initio molecular dynamics simulations to assess thermal stability.
- Analysis of crystal structure, lattice mismatch, band structure, and defect formation.
Main Results:
- Yttrium (Y) identified as an optimal dopant for Sb2Te3, preventing phase separation.
- Y-doped Sb2Te3 (YST) exhibits more than double the electrical resistivity of pure Sb2Te3 in its crystalline state.
- Y doping increases carrier effective mass and reduces carrier density by suppressing Sb_Te antisite defects.
- Improved thermal stability of amorphous YST due to stronger Y-Te interactions.
Conclusions:
- Yttrium doping is a viable strategy to overcome phase separation in Sb2Te3.
- Y-doped Sb2Te3 demonstrates significantly enhanced electrical and thermal properties for phase-change memory.
- The findings provide a pathway for developing more reliable and high-performance phase-change memory devices.
