Cathodoluminescence spectra of gallium nitride nanorods

• Published in: Nanoscale research letters Vol. 6; no. 1; p. 631
• Main Authors: Tsai, Chia-Chang, Li, Guan-Hua, Lin, Yuan-Ting, Chang, Ching-Wen, Wadekar, Paritosh, Chen, Quark Yung-Sung, Rigutti, Lorenzo, Tchernycheva, Maria, Julien, François Henri, Tu, Li-Wei
• Format: Journal Article
• Language: English
• Published: New York Springer New York 14.12.2011; Springer Nature B.V; BioMed Central Ltd; Springer
• Subjects: Chemistry and Materials Science; Materials Science; Molecular Medicine; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; cathodoluminescence; scanning electron microscopy; gallium nitride; nanorod
• ISSN: 1556-276X; 1931-7573; 1556-276X
• DOI: 10.1186/1556-276X-6-631

Gallium nitride [GaN] nanorods grown on a Si(111) substrate at 720°C via plasma-assisted molecular beam epitaxy were studied by field-emission electron microscopy and cathodoluminescence [CL]. The surface topography and optical properties of the GaN nanorod cluster and single GaN nanorod were measured and discussed. The defect-related CL spectra of GaN nanorods and their dependence on temperature were investigated. The CL spectra along the length of the individual GaN nanorod were also studied. The results reveal that the 3.2-eV peak comes from the structural defect at the interface between the GaN nanorod and Si substrate. The surface state emission of the single GaN nanorod is stronger as the diameter of the GaN nanorod becomes smaller due to an increased surface-to-volume ratio.