arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1304.7640cond-mat.mtrl-sci
收藏

石墨烯薄膜在SiC上的热力学平衡条件

Thermodynamic equilibrium conditions of graphene films on SiC

Lydia Nemec, Volker Blum, Patrick Rinke, Matthias Scheffler

摘要:

第一性原理表面相图揭示了3C-SiC(111)的Si侧上的外延单层石墨烯膜可以在实验可控条件的窄范围内作为结晶稳定相存在,从而定义了通向最高质量石墨烯膜的路径。我们的计算是基于范德瓦尔斯修正的密度泛函。零层至三层石墨烯的完整的实验观察到的(6 sqrt(3)x 6 sqrt(3))-R30超晶胞对于描述正确的界面几何形状和表面相的相对稳定性以及可能的缺陷是必不可少的。

英文摘要:

First-principles surface phase diagrams reveal that epitaxial monolayer graphene films on the Si side of 3C-SiC(111) can exist as thermodynamically stable phases in a narrow range of experimentally controllable conditions, defining a path to the highest-quality graphene films. Our calculations are based on a van der Waals corrected density functional. The full, experimentally observed (6 sqrt(3)x 6 sqrt(3))-R30 supercells for zero- to trilayer graphene are essential to describe the correct interface geometries and the relative stability of surface phases and possible defects.

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。

↑