Si diffusion path for pit-free graphene growth on SiC(0001)
文献类型：期刊论文
| 作者 | Zhu, CX ; Xu, ZG ; Huo, ZL ; Yang, R ; Zheng, ZW ; Cui, YX ; Liu, J ; Wang, YM ; Shi, DX ; Zhang, GY ; Li, FH ; Liu, M |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2011 |
| 卷号 | 84期号:19 |
| 关键词 | SELF-DIFFUSION EPITAXIAL GRAPHENE SINGLE-CRYSTALS RECONSTRUCTION SI-30 |
| ISSN号 | 1098-0121 |
| 通讯作者 | Sun, GF (reprint author), Univ Wisconsin, Dept Phys, Milwaukee, WI 53211 USA. |
| 中文摘要 | Density functional theory calculations reveal that the interfacial 6 root 3 x 6 root 3 structure [awarped graphene layer with periodic inclusions of pentagon-hexagon-heptagon (H(5,6,7)) defects] facilitates a Si diffusion path vertically through the interface layer during epitaxial growth of graphene on SiC(0001). The calculated diffusion barrier is 4.7 eV, competitive with Si interstitial diffusion of similar to 3.5 eV in SiC [M. Bockstedte et al., Phys. Rev. B 68, 205201 (2003)]. Scanning tunneling microscopy study shows that, for growth in an Ar background, where Si desorption is suppressed and all diffusion channels contribute, graphene films with reduced pit density can be grown on nominally flat SiC substrates. On the other hand, for Si diffusion-limited growth in ultrahigh vacuum, the Si interstitial diffusion is the energetically favorable path where the step edges serve as the necessary outlet toward Si desorption. The much higher density of step edges on vicinal substrates also facilitates the growth of pit-free graphene. |
| 收录类别 | SCI |
| 资助信息 | DOE [DE-FG02-07ER46228]; NSFC; MOST |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/52523]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Zhu, CX,Xu, ZG,Huo, ZL,et al. Si diffusion path for pit-free graphene growth on SiC(0001)[J]. PHYSICAL REVIEW B,2011,84(19). |
| APA | Zhu, CX.,Xu, ZG.,Huo, ZL.,Yang, R.,Zheng, ZW.,...&Liu, M.(2011).Si diffusion path for pit-free graphene growth on SiC(0001).PHYSICAL REVIEW B,84(19). |
| MLA | Zhu, CX,et al."Si diffusion path for pit-free graphene growth on SiC(0001)".PHYSICAL REVIEW B 84.19(2011). |
入库方式： OAI收割
来源：物理研究所
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