Aerosol-Assisted Chemical Vapor Deposition of CdS from Xanthate Single Source Precursors

详细信息    查看全文

• 作者：Mark A. Buckingham ; Amanda L. Catherall ; Michael S. HillAndrew L. Johnson ; James D. Parish
• 刊名：Crystal Growth & Design
• 出版年：2017
• 出版时间：February 1, 2017
• 年：2017
• 卷：17
• 期：2
• 页码：907-912
• 全文大小：473K
• ISSN：1528-7505

文摘

Bis-3-methylpyridine and bis-4-methylpyridine complexes of cadmium(II) ethylxanthate have been characterized by elemental analysis, NMR spectroscopy, and thermogravimetric analysis. The single crystal X-ray structures of both methylpyridine derivatives have also been determined and shown to display a cis, cis, cis-configuration of the N- and S-donor ligands. The compounds have been utilized as single source precursors to deposit CdS films on silica-coated glass substrates at 220 and 350 °C by aerosol-assisted chemical vapor deposition. The surface morphology of the films has been examined by scanning electron microscopy analysis and the crystalline phases were studied by powder X-ray diffraction. The films deposited from the 3-methylpyridine adduct comprised more densely packed and more highly crystalline hexagonal CdS than those provided by either of the other two precursors. The crystallite sizes were found to be <20 nm for films deposited from the pyridine and 4-methylpyridine adducts but to display a dimension of ca. 30 nm when deposited from the 3-methylpyridine precursor. Despite these differences in morphology and crystalline composition, the electronic properties of all the CdS films were deduced by UV–vis spectroscopy to be very similar and to display absorption behavior and band gaps (E_g = 2.25–2.40 eV) consistent with bulk CdS.