使用TaON/GeON双层介层的GaAs金属氧化物半导体电容器的性能提升
1School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China.
Nanomaterials (Basel, Switzerland)
|October 14, 2023
概括
双TaON/GeON界面被动化层 (IPL) 显著改善了GaAs金属氧化物半导体电容器. 这种先进的门结构增强了电气性能,并减少了缺陷,以提高设备性能.
科学领域:
- 材料科学 材料科学 材料科学
- 半导体设备物理 半导体设备物理
- 纳米技术纳米技术
背景情况:
- 化 (GaAs) 金属氧化物半导体 (MOS) 设备需要有效的界面被动化以获得最佳性能.
- 现有的被动化方法在防止原子扩散和保持门堆完整性方面面临着挑战.
- 像ZrTaON这样的高k介电材料对于缩小MOS设备至关重要,但需要强大的接口层.
研究的目的:
- 在GaAs MOS电容器中实施和评估一种新型的双界面受动化层 (IPL),包括TaON/GeON.
- 调查这种双重IPL对接口特性,电气特性和缺陷减少的影响.
- 为了比较双IPL与单一IPL (GeON) 和无IPL配置的性能.
主要方法:
- 使用ZrTaON高k介电体制造的GaAs MOS电容器.
- 在GaAs和高k介电体之间实施双TaON/GeON界面被动化层 (IPL).
- 电气特性包括接口状态密度和门泄漏电流测量.
- 使用材料表征技术 (隐含) 分析原子扩散和相互扩散.
主要成果:
- 双TaON/GeON IPL表现出优异的性能,与只有GeON的IPL和没有IPL相比.
- 实现了1.31 × 1012 cm-2 eV-1 的低接口状态密度.
- 记录了一个小门泄漏电流密度为1.62 × 10-5 A cm-2 在V + 1 V.
- 获得了 18.0.0 的高等效介电常数.
结论:
- 双TaON/GeON IPL有效地抑制了Ga/As的外扩散和氧的内扩散,保护了门.
- 陶层防止了Zr/Ge的相互扩散,避免了有害的反应,并减少了GaAs接口上的缺陷.
- 这种双IPL方法显著提高了GaAs MOS电容器的界面和电气性能.
相关概念视频
MOS Capacitor
815
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
815
Capacitor With A Dielectric
4.0K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.0K
Biasing of Metal-Semiconductor Junctions
262
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
262
Equivalent Capacitance
1.4K
Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
The following strategies are adopted to calculate...
The following strategies are adopted to calculate...
1.4K
Metal-Semiconductor Junctions
360
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
360
Dielectric Polarization in a Capacitor
4.7K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.7K


