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不同极性6H-SiC表面石墨烯的制备及其电子结构的研究

Preparation of graphene on different-polarity 6H-SiC substrates and the study of their electronic structures

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【作者】 康朝阳唐军李利民潘海斌闫文盛徐彭寿韦世强陈秀芳徐现刚

【Author】 Kang Chao-Yang1) Tang Jun1) Li Li-Min1) Pan Hai-Bin1) Yan Wen-Sheng1) Xu Peng-Shou1) Wei Shi-Qiang1) Chen Xiu-Fang2) Xu Xian-Gang2) 1)(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China) 2)(State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China)

【机构】 中国科学技术大学国家同步辐射实验室山东大学晶体材料国家重点实验室

【摘要】 在超高真空设备中,采用高温退火的方法在6H-SiC两个极性面(0001)和(0001-)面(即Si面和C面)外延石墨烯(EG).利用低能电子衍射(LEED)和同步辐射光电子能谱(SRPES)对样品的生长过程进行了原位研究,而后利用激光拉曼光谱(Raman)和近边X射线吸收精细结构(XANES)等实验技术对制备的样品进行了表征.结果表明我们在两种极性面均制备出了质量较好的石墨烯样品.而有关两种石墨烯的对比性研究发现:Si面EG呈同一取向而C面EG呈各向异性;Si面EG与衬底存在类似于金刚石C—sp3键的界面相互作用,受到衬底的影响较大,而C面EG与衬底的相互作用较弱,受到衬底的影响较小.

【Abstract】 The epitaxial graphene(EG) layers are grown on Si-terminated 6H-SiC(0001) substrates and C-terminated 6H-SiC(0001-) substrates separately by thermal annealing in an ultrahigh vacuum chamber.Low energy electron diffraction(LEED) and synchrotron radiation photoelectron spectroscopy(SRPES) are used to in-situ study the synthesis process,and the prepared samples are characterized by Raman spectrum,and near edge X-ray absorption fine structure(XANEX).The results show that we have successfully prepared high-quality EG layers on the two polar surfaces of 6H-SiC.The comparisons studies indicate that Si terminated EG is highly oriented while C terminated EG is anisotropic,and that the interface interaction similar to that of C-sp3 bond of diamond exists on the Si terminated EG,the interaction between the epitaxial film and substrate is stronger,while on the C terminated EG there is no such interaction,and the interaction between the epitaxial film and substrate is weaker.

【关键词】 石墨烯6H-SiC同步辐射电子结构
【Key words】 graphene6H-SiCsynchrotron radiationelectronic structure
【基金】 国家自然科学基金(批准号:50872128,50802053)资助的课题~~
  • 【文献出处】 物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,2011年04期
  • 【分类号】O481
  • 【被引频次】13
  • 【下载频次】625
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