Journal
APPLIED PHYSICS LETTERS
Volume 118, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0051288
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Funding
- National Natural Science Foundation of China [61904091, 61775111, 61775109, 62074089]
- Zhejiang Provincial Natural Science Foundation of China [LR18E010002, LY21F040003]
- 3315 Innovation Team in Ningbo City
- K. C. WongMagna Fund in Ningbo University, China
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The study shows that a small amount of calcium doping can significantly enhance the thermal stability of GeTe films without significantly affecting the maximum crystal growth rate. In addition, no calcium-related crystalline phases or chemical bonds were found in the doped GeTe, indicating that the calcium atoms are in a free state within the GeTe matrix.
Doping is an effective way to improve the performance of conventional phase-change materials. We introduced an alkaline element calcium (Ca) in GeTe films and studied their crystallization kinetics by using flash DSC. It was found that a small amount of Ca doping (4.0 at. %) can significantly enhance the thermal stability, but the maximum crystal growth rate does not decrease significantly. Moreover, no any Ca-related crystalline phase and Ca-related chemical bond can be found in Ca-doped GeTe, implying that Ca atoms are in free state in GeTe matrix.
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