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arXiv 1003.0202cond-mat.mes-hallcond-mat.mtrl-sci
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共振散射体对石墨烯载流子迁移率的限制

On resonant scatterers as a factor limiting carrier mobility in graphene

Z. H. Ni, L. A. Ponomarenko, R. R. Nair, R. Yang, S. Anissimova, I. V. Grigorieva, F. Schedin, Z. X. Shen, E. H. Hill, K. S. Novoselov, A. K. Geim

摘要:

我们发现,沉积在衬底上的石墨烯具有不可忽略的原子尺度缺陷密度。这通过拉曼光谱中先前未注意到的D峰来证明,该D峰的强度相对于G峰约为1%。我们评估了这些杂质对电子输运的影响,通过模拟它们与氢吸附物和测量迁移率和拉曼强度的诱导变化。如果负责D峰的谷间散射体是单价的,则它们的浓度足以说明在衬底上的石墨烯中可实现的有限迁移率。

英文摘要:

We show that graphene deposited on a substrate has a non-negligible density of atomic scale defects. This is evidenced by a previously unnoticed D peak in the Raman spectra with intensity of about 1% with respect to the G peak. We evaluated the effect of such impurities on electron transport by mimicking them with hydrogen adsorbates and measuring the induced changes in both mobility and Raman intensity. If the intervalley scatterers responsible for the D peak are monovalent, their concentration is sufficient to account for the limited mobilities achievable in graphene on a substrate.

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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