Multi-layered nanostructure Bi2Se3 grown by chemical vapor deposition in selenium-rich atmosphere

• Published in: Applied surface science Vol. 317; pp. 257 - 261
• Main Authors: Liu, Mei, Liu, Fu Yan, Man, Bao Yuan, Bi, Dong, Xu, Xue You
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.10.2014; Elsevier
• Subjects: Asymmetry; Atmospheres; Bismuth; Bismuth selenide; Chemical vapor deposition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Elongation; Exact sciences and technology; Multi-layered nanostructure; Nanostructure; Nucleation; Physics; Selenides; Topological insulator; Topological insulator; Multi-layered nanostructure; Bismuth selenide; Chemical vapor deposition; CVD; Bismuth selenides; Multilayers; Inorganic compounds; Binary compounds; Nanostructures; Selenium; Film growth
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2014.08.103

•The multi-layered nanostructured Bi2Se3 were prepared by CVD using the high purity Se and Bi2Se3 powder as source materials to decrease the Se vacancies in the products.•The wide nanoribbons grown along the [1 1 2¯ 0] direction were prepared, and the growth mechanism along the different directions was analyzed.•The low-temperature growth mechanism of the multi-layered Bi2Se3 nanostructure was analyzed by the Raman spectra with different depths. High quality multi-layered nanostructured bismuth selenide (Bi2Se3) with an asymmetric, elongated hexagonal morphology were obtained in a selenium-rich atmosphere by chemical vapor deposition (CVD) using high purity Se and Bi2Se3 powder as source materials. The measurement results reveal that Au particles only serve as the initial stage nucleation of the Bi2Se3 nanostructures at a low temperature. The Se powder in the source materials is helpful to ensure the stoichiometry and decrease the selenium vacancies, and causes the wide Bi2Se3 nanoribbons to grow along the lateral direction.