ZnS he ZnSSe na mi jie gou de sheng chang he guang xue xing zhi

In addition, we have studied the growth conditions and the properties of ZnSSe alloy nano-tetrapods grown by chemical vapor deposition. Different from the ZnSSe nanowires synthesized by MOCVD, the ZnSSe nano-tetrapods are of hexagonal structure. We observed a wavelength-tunable near band gap luminescence in the UV-blue region from this nanostructurally-designed system.Recently, semiconductor nanostructures have attracted much attention because they are potentially useful as fundamental building blocks in nanodevices. As an important member of group II-VI semiconductors, ZnS and its alloys with ZnSe are particularly important for optical applications in the UV-blue region . Thus, we concentrated on the synthesis of ZnS, ZnSe and ZnSSe nanostructures and studied their optical properties.Vertically-aligned ZnSe nanowires were also synthesized by MOCVD using Ag and Ga nanoparticles as catalysts. In the photoluminescence spectra from Ag or Ga catalyzed ZnSe nanowires, we observed recombination of excitons bound to substitutional Ag or Ga impurities respectively, which indicates that Ag and Ga have been doped into ZnSe nanowires in our experiments.We are among the first group to grow vertically well-aligned ZnSSe alloy nanowires of controllable composition. Most of ZnSSe nanowires were found to have a cubic structure. We also found a compositional relationship between the nanowires and precursors, which is useful for predicting the lattice constant and band-gap emission energy of ZnSSe nanowires.ZnS nanowire arrays were fabricated on the GaAs (100), (110) (311)A and (111)B substrates by metal organic chemical vapor deposition (MOCVD) using Ag, Au and Ga particles as catalysts. Their orientation was adjusted by changing the crystallographic orientation of the substrate. Moreover, Ga was doped into ZnS nanowires, when Ga nanoparticles serve as catalysts.Liang, Yao = ZnS和ZnSSe納米結構的生長和光學性質 / 梁瑤.Adviser: Hank Suikong.Source: Dissertation Abstracts International, Volume: 72-11, Section: B, page: .Thesis (Ph.D.)--Chinese University of Hong Kong, 2009.Includes bibliographical references.Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.Abstract also in Chinese.Liang, Yao = ZnS he ZnSSe na mi jie gou de sheng chang he guang xue xing zhi / Liang Yao