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arXiv 1209.0489cond-mat.mtrl-sci
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溅射法制备大面积石墨烯

Growth of large area graphene from sputtered films

Genhua Pan, Mark Heath, David Horsell, M. Lesley Wears

摘要:

使用工业规模的薄膜沉积工具大规模生产石墨烯的技术可能是实际实现这种材料的广泛技术应用的关键。在这里,我们展示了在650至1000 oC的温度范围内使用原位或非原位快速热处理从溅射膜(含碳层和金属层)生长大面积多晶石墨烯。发现石墨烯总是生长在堆叠的顶表面上,与Ni或Ni-硅化物紧密接触。在优化的条件下获得了高质量剥离单层石墨烯的典型拉曼光谱。发现快速冷却速率对于单层石墨烯的形成是必不可少的。在SiC顶部具有Ni的样品产生具有~40%表面积覆盖率的最佳单层石墨烯光谱,而在SiC下方具有Ni的样品产生质量较差的石墨烯,但覆盖率为99%。溅射工艺的灵活性允许进一步优化生长,并有可能在真空中将石墨烯转移到任何绝缘体衬底上。我们提出了一种生产绝缘体上石墨烯晶片的潜在途径,这将有助于将石墨烯轻松集成到现代半导体器件工艺流程中。

英文摘要:

Techniques for mass-production of large area graphene using an industrial scale thin film deposition tool could be the key to the practical realization of a wide range of technological applications of this material. Here, we demonstrate the growth of large area polycrystalline graphene from sputtered films (a carbon-containing layer and a metallic layer) using in-situ or ex-situ rapid thermal processing in the temperature range from 650 to 1000 oC. It was found that graphene always grows on the top surface of the stack, in close contact with the Ni or Ni-silicide. Raman spectra typical of high quality exfoliated monolayer graphene were obtained for samples under optimised conditions. A fast cooling rate was found to be essential to the formation of monolayer graphene. Samples with Ni atop SiC produced the best monolayer graphene spectra with ~40% surface area coverage, whereas samples with Ni below SiC produced poorer quality graphene but 99% coverage. The flexibility of the sputtering process allows further optimization of the growth, with possibility of transferring the graphene to any insulator substrate in vacuum. We present a potential route for the production of graphene-on-insulator wafers, which would facilitate easy integration of graphene into modern semiconductor device process flows.

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