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arXiv 1009.4680cond-mat.mtrl-scicond-mat.mes-hall
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低压laser化学气相沉积法制备Cr2O3薄膜

Cr2O3 thin films grown at room temperature by low pressure laser chemical vapour deposition

P. M. Sousa, A. J. Silvestre, O. Conde

摘要:

由于氧化铬(Cr2 O3)在单一氧化物材料中具有多种机械、物理和化学性质,因此为了开发广泛的工业应用而对其进行了广泛的研究。各种方法已被用于大面积合成Cr2 O3薄膜。然而,对于选择性区域生长和热敏材料上的生长,可以有利地应用激光辅助化学气相沉积(LCVD)。在这里,我们报告的单层纯Cr2 O3蓝宝石衬底上的生长在室温下通过低压光解LCVD,使用UV激光辐射和Cr(CO)6作为铬前体。论证了LCVD技术用于选择性区域沉积氧化铬薄膜的可行性。最好的结果,获得了120毫焦耳cm-2的激光能量密度和分压比的O2的Cr(CO)6的1.0。用这些实验参数生长的样品是多晶的,并且它们的微观结构的特征在于其尺寸遵循对数正态分布的高密度颗粒。测得这些薄膜的沉积速率为0.1 nm s-1,平均粒径为1.85 μm。

英文摘要:

Chromia (Cr2O3) has been extensively explored for the purpose of developing widespread industrial applications, owing to the convergence of a variety of mechanical, physical and chemical properties in one single oxide material. Various methods have been used for large area synthesis of Cr2O3 films. However, for selective area growth and growth on thermally sensitive materials, laser-assisted chemical vapour deposition (LCVD) can be applied advantageously. Here we report on the growth of single layers of pure Cr2O3 onto sapphire substrates at room temperature by low pressure photolytic LCVD, using UV laser radiation and Cr(CO)6 as chromium precursor. The feasibility of the LCVD technique to access selective area deposition of chromia thin films is demonstrated. Best results were obtained for a laser fluence of 120 mJ cm-2 and a partial pressure ratio of O2 to Cr(CO)6 of 1.0. Samples grown with these experimental parameters are polycrystalline and their microstructure is characterised by a high density of particles whose size follows a lognormal distribution. Deposition rates of 0.1 nm s-1 and mean particle sizes of 1.85 μm were measured for these films.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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