原子层沉积HfO的原子层沉积
Sylwia Gieraltowska1, Lukasz Wachnicki1, Piotr Dluzewski1
1Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, 02-668 Warsaw, Poland.
Materials (Basel, Switzerland)
|June 10, 2023
概括
研究了二氧化 (HfO2) 薄膜的原子层沉积 (ALD). 较高的温度提高了薄膜的结晶性和介电性质,氨水增强了介电常数.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 薄膜沉积的情况
背景情况:
- 二氧化哈夫尼 (HfO2) 是先进微电子学的关键材料,因为它具有很高的介电常数.
- 控制HfO2膜的结构和电气性能对于设备的性能至关重要.
- 原子层沉积 (ALD) 能够在原子层精确控制膜的生长.
研究的目的:
- 调查沉积温度和氧前体对ALD培养的HfO2薄膜性能的影响.
- 了解生长参数与产生的薄膜晶度,介电常数和粗度之间的关系.
- 探索微调HfO2膜特性以提高性能的方法.
主要方法:
- 使用TDMAH和水或氨水进行HfO2的原子层沉积 (ALD).
- 不同的沉积温度低于400°C.
- 薄膜性质的表征包括每周期增长 (GPC),介电常数,粗度和晶体结构.
主要成果:
- HfO2薄膜沉积的每周期增长率 (GPC) 在1.2-1.6 Å.之间.
- 较低的温度 (≤100°C) 导致更快的生长,但更混乱的膜.
- 较高的温度 (240°C和300°C以上) 导致结晶性改善和生长速度减缓.
- 氨水作为前体增加了与水相比的介电常数.
- 介电性质和粗度取决于晶体相 (无形,单临床,正方形) 的不同.
结论:
- 沉积温度显著影响ALD HfO2膜的结构和电气性能.
- 优化温度和前体选择 (氨水) 可以增强介电常数和结晶性.
- 这项研究为定制应用程序控制HfO2膜特性提供了洞察力.
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