Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8160503 | Physica B: Condensed Matter | 2018 | 38 Pages |
Abstract
Hexagonal nanocrystallites of ZnO in the form of thin films were prepared by radio frequency sputtering technique. X-ray diffraction analysis reveals two prominent diffraction planes (002) and (103) at diffraction angles around 34.3 and 62.8°, respectively. The crystallite size increases through (103) plane from 56.1 to 64.8â¯Ã
as film thickness changed from 31â¯nm up to 280â¯nm while crystallites growth through (002) increased from 124 to 136â¯Ã
as film thickness varies from 31 to 107â¯nm and dropped to 115.8â¯Ã
â¯at thickness 280â¯nm. The particle shape changes from spherical to longitudinal form. The particle size is 25â¯nm for films of thickness below 107â¯nm and increases at higher thicknesses (134 and 280â¯nm) from 30 to 40â¯nm, respectively. Optical band gap is deduced to be direct with values varied from 3.22 to 3.28â¯eV and the refractive index are evaluated based on the optical band values according to Moss, Ravindra-Srivastava, and Dimitrov-Sakka models. All refractive index models gave values around 2.3.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Ahmed H. Hammad, M. Sh. Abdel-wahab, Sajith Vattamkandathil, Akhalakur Rahman Ansari,