Optical and structural properties of catalyst-free synthesized leaves like CdS films

被引:0
|
作者
Mohamed, S. H. [1 ,2 ]
Tomsah, I. B. I. [1 ]
El-Hagary, M. [1 ,3 ]
机构
[1] Qassim Univ, Coll Sci, Dept Phys, Buryadh 51452, Saudi Arabia
[2] Sohag Univ, Fac Sci, Dept Phys, Sohag 82524, Egypt
[3] Helwan Univ, Fac Sci, Dept Phys, Cairo 11792, Egypt
来源
OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS | 2013年 / 7卷 / 7-8期
关键词
Vapor transport; CdS nanoleaves; Optical constants; THIN-FILMS; SOLVOTHERMAL SYNTHESIS; NANOWIRES; GROWTH; PHOTOLUMINESCENCE; NANOPARTICLES; NANOCRYSTALS; EVAPORATION; SUBSTRATE; OXIDE;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Leaves like CdS films were grown on catalyst-free Si(100) and quartz substrates by vapor transport of CdS powder at 850 degrees C. Randomly aligned nanoleaves with different shapes were observed. X-ray diffraction analysis revealed that the leaves like CdS is a single phase nature with hexagonal crystal structure. The optical functions of CdS films have been determined by ellipsometry investigations from 400 - 1100 nm. A two layer model employing the Cauchy dispersion model for the main layer and Bruggeman effective medium approximation (BEMA) for the surface layer was found to be sufficient and reasonable. The obtained optical constants were compared with those obtained by other preparation methods. The transmittance has high values while the reflectance has low values in the wavelength range 450 - 2500 nm. A direct optical band gap value of 2.41 eV and Urbach energy of 2671 meV were obtained.
引用
收藏
页码:485 / 489
页数:5
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