通过高效的声计算,找到金属原子层沉积的温度窗口
Alexandr Fonari1, Simon D Elliott2, Casey N Brock1
1Schrödinger Inc., 1540 Broadway, Floor 24, New York, NY 10036, USA. alexandr.fonari@schrodinger.com.
Physical chemistry chemical physics : PCCP
|October 13, 2025
概括
密度函数理论 (DFT) 解释了膜的生长. 计算热力学揭示了水溶解在113°C以上是金属原子层沉积 (ALD) 的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
- 计算化学计算化学
背景情况:
- 原子层沉积 (ALD) 对于超薄膜生长至关重要.
- 使用RuO4和H2的 (Ru) 膜沉积仅限于特定的温度范围.
- 了解气体表面化学是优化ALD过程至关重要的.
研究的目的:
- 在Ru ALD期间使用第一原理热力学研究气体表面化学.
- 为了合理化实验观察到Ru膜生长的狭窄温度窗口.
- 预测ALD的增长速度,并确定ALD过程中的限制因素.
主要方法:
- 使用周期密度函数理论 (DFT) 的计算.
- 使用了第一原理热力学,包括从声子计算中得到的吉布斯自由能量校正.
- 施罗丁格材料科学套件促进了表面声子的快速计算.
主要成果:
- DFT的计算成功地复制了Ru ALD.的实验温度窗口.
- 计算的反应自由能量显示,水在113°C以上被吸收,使Ru金属沉积成为可能.
- 确定Ru的每周期0.7 Å的预测增长率.
- 在较低的温度下,预测可以预测水的保留和与RuO4的反应,形成氧化物膜.
结论:
- 第一原理热力学准确地模拟了Ru ALD过程.
- 水溶解是确定Ru金属沉积下限温度的关键步骤.
- 气相显著影响反应的自由能量,为简化预选方法提供了潜力.
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