相关实验视频
Updated: Jun 5, 2025
08:43
Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
Published on: October 27, 2018
17.9K
兰-联合兴奋剂对氧化物铁电晶体结构的影响
Zhenhai Li1,2, Shuqi Tang1, Tianyu Wang3,4
1School of Microelectronics, Fudan University, State Key Laboratory of Integrated Chips and Systems, Shanghai, 200433, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|December 4, 2024
概括
和联合合的氧化 (HfAlAO) 薄膜可以提高铁电记忆性能. 优化的兴奋剂促进了稳定的晶体相,导致HfO2器件中优越的残余极化和热稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 电气工程 电气工程
背景情况:
- 基于氧化 (HfO2) 的材料对于需要高速和低功耗的高级内存应用至关重要.
- HfO2薄膜的铁电特性对注和晶相敏感,影响设备性能.
- 优化兴奋剂策略是释放HfO2在记忆技术中的全部潜力的关键.
研究的目的:
- 为了研究 (Al) 和 (La) 联合兴奋剂对HfO2薄膜的铁电特性的影响.
- 为了确定最佳的Al/La比,以提高铁电特性和热稳定性.
- 在3D垂直铁电内存架构中探索这些联合化HfO2膜的潜力.
主要方法:
- 制造和表征HfO2薄膜,具有不同度的Al和La兴奋剂.
- 铁电性能测量,包括残余极化和强制场.
- 分析兴奋剂对晶体相形成的影响的第一原则计算 (o相对准电相).
- 使用优化的HfO2薄膜制造和测试垂直铁电式内存设备.
主要成果:
- 使用4.2%Al和2.17%La的HfAlAO装置显示出优异的残余极化和热稳定性.
- 第一原则分析证实,这种兴奋剂度促进了O相,增强了铁电行为.
- 垂直铁电内存设备表现出优异的铁电特性 (22μC cm-2在4.5 MV cm-1),低强制场 (≈1.6 V),快速响应速度 (20 ns) 和高耐久性 (1010 个周期).
结论:
- 与特定比例的Al和La一起配合HfO2显著改善了铁电特性和热稳定性.
- 增强的铁电性归因于形 (o相) 晶体结构的稳定.
- 开发的垂直铁电式内存设备显示了下一代高速,低功耗内存应用的有希望的性能.
相关概念视频
02:58Crystal Field Theory - Octahedral Complexes
26.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.2K
02:54Trends in Lattice Energy: Ion Size and Charge
23.7K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.7K
02:37Metallic Solids
18.2K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.2K
02:42Ionic Crystal Structures
14.1K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.1K
03:02Colors and Magnetism
11.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.5K