High-index substrates, such as Si (5 5 12), provide self-assembled one-dimensional periodic array of structures upon reconstruction and can be used as templates for growth of aligned nanoscale structures. Crystalline quality of Ag nanostructures grown under UHV conditions using a molecular beam epitaxy system on reconstructed Si (5 5 12) surface is compared with those structures grown on HF-treated and native-oxide-covered Si (5 5 12) surfaces. These have been characterized by using reflection high-energy electron diffraction (RHEED), transmission electron microscopy (TEM) and in situ scanning tunneling microscopy methods. The RHEED and TEM studies confirm the polycrystalline, textured and crystalline nature of the Ag nanostructures grown on Si (5 5 12) with native oxide, HF-treated, and reconstructed surfaces, respectively. The crystalline quality of Ag nanostructures on HF-treated substrate was found to improve at higher substrate temperatures during growth.
|Journal||Applied Physics A: Materials Science and Processing|
|State||Published - 1 Apr 2016|