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A comparative study on atomic layer deposited oxide film morphology and their electrical breakdown
Surface & Coatings Technology ( IF 5.3 ) Pub Date : 2020-07-05 , DOI: 10.1016/j.surfcoat.2020.126123
I. Reklaitis , E. Radiunas , T. Malinauskas , S. Stanionytė , G. Juška , R. Ritasalo , T. Pilvi , S. Taeger , M. Strassburg , R. Tomašiūnas

Transition metal oxide films HfO2, ZrO2, Ta2O5, TiO2, Nb2O5, and Y2O3, together with Al2O3 and SiO2 for reference, were deposited by atomic layer deposition (ALD) and investigated. For all the films ALD process was performed within the same reactor at two temperature ranges 100–125C and 250–300C. Both water and ozone were used as oxygen sources if processes were available. Most films are amorphous as-deposited, but HfO2, ZrO2, and Y2O3 can be crystalline, depending on deposition temperature and oxygen source.

After deposition and initial characterization, the films were annealed to different temperatures up to 1200C, depending on the material, to observe the crystallization process.

When crystalline phases were observed, grain sizes have been derived from the X-ray diffractograms and compared with feature sizes in SEM images. RMS analysis revealed a general tendency - an increase of roughness with the appearance of crystallization.

The temperature-dependent morphological investigations were supported by breakdown field measurements. Those are also strongly affected when a film becomes crystalline. Most values observed for break down fields agree with literature, some values exceed previously reported numbers.



中文翻译:

原子层沉积的氧化膜形态及其电击穿性能的比较研究

过渡金属氧化物膜的HfO 2,的ZrO 2,钽2 ø 5,的TiO 2,NB 2 ø 5,和Y 2 ö 3用Al,一起2 ö 3和SiO 2供参考,通过原子层沉积被沉积(ALD)并进行调查。范围100-125对于所有在两个温度相同的反应器内进行薄膜ALD工艺 C和250-300 C.水和臭氧用作氧源,如果过程可用。大多数薄膜是非晶态沉积的,但是HfO 2,ZrO 2取决于沉积温度和氧气源,Y 2 O 3可以是晶体。

沉积和初始特性后,将膜退火到不同的温度高达1200 C,取决于材料,观察其结晶过程。

当观察到结晶相时,晶粒尺寸已从X射线衍射图得出,并与SEM图像中的特征尺寸进行了比较。RMS分析显示出总体趋势-粗糙度随结晶外观的增加而增加。

温度依赖性形态研究得到击穿场测量的支持。当膜变成结晶时,那些也会受到很大影响。对于分解字段观察到的大多数值与文献一致,某些值超过了先前报告的数字。

更新日期:2020-07-05
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