Comparative study of the interfaces of graphene and hexagonal boron nitride with silver
Comparative study of the interfaces of graphene and hexagonal boron nitride with silver
复制标题
石墨烯和六方氮化硼与银界面的对比研究
DOI：
10.1103/physrevb.94.155431
复制
发表时间：
2019
影响因子：
3.7
通讯作者：
W. Auwärter
中科院分区：
文献类型：
--
作者：
M. Garnica;M. Schwarz;J. Ducke;F. Bischoff;J.V. Barth;D. Stradi;W. Auwärter
银在其(111)面上生长硅层后，在基于异质外延层的复杂系统的制备中开辟了有趣的前景。在这项工作中，我们探索了六方氮化硼(-BN)和石墨烯在银上的不同合成方法。用高分辨率扫描隧道显微镜对所得的层进行了检测。用扫描隧道谱和互补第一原理计算比较了界面电子能带结构对不同二维(2D)层生长的影响。我们证明了2D层的吸附通过降低局域功函数来影响Shockley态的结合能和表面势。在石墨烯的情况下，这些影响更大，因为电荷转移到石墨烯，使Ag(111)的表面态减少。此外，我们还发现，从铜(111)表面的几层单分子膜到单晶的银衬底，不同厚度的银可以调节-BN/银体系的电子性质。
Silver opens up interesting perspectives in the fabrication of complex systems based on heteroepitaxial layers after the growth of a silicene layer on its (111) face has been proposed. In this work we explore different synthesis methods of hexagonal boron nitride (-BN) and graphene sheets on silver. The resulting layers have been examined by high-resolution scanning tunneling microscopy. A comparison of the interfacial electronic band structure upon growth of the distinct two-dimensional (2D) layers has been performed by scanning tunneling spectroscopy and complementary first-principle calculations. We demonstrate that the adsorption of the 2D layers has an effect on the binding energy of the Shockley state and the surface potential by lowering the local work function. These effects are larger in the case of graphene where the surface state of Ag(111) is depopulated due to charge transfer to the graphene. Furthermore, we show that the electronic properties of the-BN/silver system can be tuned by employing different thicknesses of silver ranging from a few monolayers on Cu(111) to the single crystal Ag substrate.