期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 39, 页码 21819-21827出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b05703
关键词
Ge2Sb2Te5; GeTe; phase-change memory; thermal conductivity; bipolar switching property
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2015R1A2A1A01007560]
- MOTIE (Ministry of Trade, Industry Energy [10045360]
- KSRC (Korea Semiconductor Research Consortium)
- National Research Foundation of Korea [2015R1A2A1A01007560] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The thermal conduction characteristics of GeTe and Ge2Sb2Te5(GST) nanowires were investigated using an optical method to determine the local temperature by Raman spectroscopy. Since the localization of surface charge in a single-crystalline nanostructure can enhance charge-phonon scattering, the thermal conductivity value (kappa) of single crystalline GeTe and GST nanowires was decreased significantly to 1.44 Wm(-1) K-1 for GeTe and 1.13 Wm(-1) K-1 for GST, compared to reported values for polycrystalline structures. The SET-to-RESET state in single-crystalline GeTe and GST nanowires are characteristic of a memory device. Unlike previous reports using GeTe and GST nanowires, the SET-to-RESET characteristics showed a bipolar switching shape and no unipolar switching. In addition, after multiple cycles of operation, a significant change in morphology and composition was observed without any structural phase transition, indicating that atoms migrate toward the cathode or anode, depending on their electronegativities. This change caused by a field effect indicates that the structural phase transition does not occur in the case of GeTe and GST nanowires with a significantly lowered thermal conductivity and stable crystalline structure. Finally, the formation of voids and hillocks as the result of the electromigration critically degrades device reliability.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据