Article
Chemistry, Physical
Jin Zhao, Zhenhui Yuan, Wen-Xiong Song, Zhitang Song
Summary: This study investigates the strategy of doping to improve the performance of phase-change memory, choosing erbium as the dopant to enhance operation speed and data retention. The designed EST phase-change memory meets the requirements and provides general doping rules for better comprehensive performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Junshi Zhao, Qi Liang, Ying Chen, Sifan Zhang, Zhitang Song, Sannian Song, Zhongyuan Ma, Liangcai Wu
Summary: The RST phase change material has significantly improved data retention, fast operation speed, high resistance ratio, small density change, low operation voltage, and power consumption, making it a promising material for high performance applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jing Hu, Cong Lin, Liyu Peng, Tao Wei, Wanfei Li, Yun Ling, Qianqian Liu, Miao Cheng, Sannian Song, Zhitang Song, Jian Zhou, Yan Cheng, Yonghui Zheng, Zhimei Sun, Bo Liu
Summary: Transition metal doping, such as Cr doping, is an effective strategy to improve the properties of phase-change random access memory (PCRAM). In this study, a Cr-doped Sb2Te film was fabricated and the enhancement mechanism of Cr doping was investigated through experiments and calculations. The results showed that Cr atoms preferentially substituted the Sb1 site, improving the crystalline phase stability and crystallization temperature. In addition, in the amorphous phase, Cr atoms formed tight clusters, resulting in a faster phase-change speed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Peng Xu, Yun Meng, Zhen Li, Xiaolin Liu, Jian Zhou, Sannian Song, Zhitang Song, Zhimei Sun, Liangcai Wu
Summary: In this study, a graphite carbon-doped Sb2Te (C-Sb2Te) chalcogenide with excellent thermal stability and high operation speed was proposed. The thickness change and resistance drift were found to be only 0.89% and 0.0149, respectively. The C-Sb2Te-based memory device exhibited high switching speed, low power consumption, and low operation voltage. Ab initio molecular dynamics simulations revealed that C-C and C-Sb bonds as well as C-C chains were formed in C-Sb2Te, leading to its high performance.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yuan Xue, Shuai Yan, Shilong Lv, Sannian Song, Zhitang Song
Summary: Phase-change memory based on Ta-doped antimony telluride (Sb2Te) exhibits high-speed characteristics and excellent high-temperature characteristics, with good thermal stability and long-term endurance through the formation of small grains.
NANO-MICRO LETTERS
(2021)
Article
Chemistry, Physical
Yi Shuang, Shogo Hatayama, Yuta Saito, Paul Fons, Alexander Kolobov, Daisuke Ando, Yuji Sutou
Summary: This study investigates the impact of nitrogen doping on the structure and electrical properties of Cr2Ge2Te6 phase-change memory materials. It is found that nitrogen doping inhibits the formation of Cr nanoclusters, leading to a decrease in resistivity change upon the amorphous to crystalline phase transition.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Condensed Matter
Lei Kang, Leng Chen
Summary: The local structure of liquid Sb2Te exhibits a mixed bonding geometry with an increase in Sb-Sb bonds and a decrease in Sb-Te bonds, while the amorphous Sb2Te is predominantly in an octahedral environment. This structural transformation involves the formation of homopolar bonds and the breaking of heteropolar bonds in the liquid phase, and an increase in the fraction of octahedron and a decrease in average coordination number in the amorphous phase. The octahedral geometry in both crystalline and amorphous Sb2Te enhances the local structural similarity, facilitating rapid low-energy crystallization.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Cong Lin, Jing Hu, Tao Wei, Wanfei Li, Yun Ling, Qianqian Liu, Miao Cheng, Sannian Song, Zhitang Song, Yan Cheng, Yonghui Zheng, Bo Liu
Summary: In this study, Cr was used as a dopant to improve the performance of Sb2Te in PCRAM. The as-prepared Cr0.39Sb2Te (CST) showed high crystallization temperature, good data retention, and high stability, making it a potential candidate for universal memory devices.
Article
Materials Science, Multidisciplinary
Zong-Yan Zhao, Shuo Peng, Zhi-Long Tan, Chuan-Jun Wang, Ming Wen
Summary: In this study, the crystal structure and electronic structure of Ru-doped Sb2Te and Sb2Te3 were systematically analyzed using the first-principles method. It was found that the substitution doping of Ru at the Sb site can improve the stability and crystallization temperature of the phase change materials while maintaining their rapid reversible phase transition properties.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Zhihao Song, Junmei Guo, Jialin Chen, Ming Wen, ZhiLong Tan, Chuanjun Wang, Weiming Guan, Kunhua Zhang
Summary: In this paper, PtSb2Te (PST) phase change material is proposed for PCM, with doping of Pt improving crystallization temperature and data-retention temperature, refining grain size, reducing density change after phase transition, and requiring only a 10 ns electrical pulse for reversible operation. PST-based PCM cell has high cycle operations, low resistance drift, and operates with a Reset voltage lower than 4.3 V.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Thermodynamics
Xi Meng, Li Meng, Junlong Zou, Fan He
Summary: Phase-Change Materials have high thermal storage density but limited thermal conductivity. Copper foam fins were used to improve the thermal performance, with seven different shapes considered. Results showed similar rules in solidification and melting processes, with natural convection heat transfer present but negligible in solidification.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Yanna Gao, Fudan Liu, Jiahui Wang, WeiRui Ye, Xi Meng
Summary: By filling metal foam and optimizing foam shapes, the thermal transfer performance and enhancement benefit of phase-change energy storage system can be significantly improved.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Materials Science, Multidisciplinary
Ying Tao, Yu Zhang, Yadong Ma, Zhenzhen You, Yegang Lu
Summary: The presence of Zr in Sb2Te films can significantly improve crystallization temperature, data retention, phase stability, and thermal stability, while also refining the grain size and increasing crystalline resistivity. These findings suggest potential for Zr-Sb-Te in developing nonvolatile and reconfigurable devices.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
K. Venkateshwar, S. H. Tasnim, S. A. Gadsden, S. Mahmud
Summary: Thermal rectifiers, which can selectively control the flow of heat, have received increasing attention due to their potential applications. Recent studies have focused on the influence of thermal conductivity and density of phase change materials on thermal rectification, and have developed optimization criteria and expressions.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Review
Energy & Fuels
Jiyuan Liang, Xuelai Zhang, Jun Ji
Summary: Passive temperature and humidity independent control technology plays a significant role in building construction, with factors such as moisture buffer value, phase change materials, and microcapsule technology enhancing energy efficiency and humidity control. Materials like hygroscopic phase change composite materials (HPCCMs) combine advantages to meet indoor thermal comfort requirements.
JOURNAL OF ENERGY STORAGE
(2021)