Enhancement in optical and structural properties of Zn0.85Mg0.15O nanorods over thin films synthesized by hydrothermal chemical treatment

P. Murkute; N. Sehara; H. Ghadi; S. K. Pandey; S. Maity; S. Chakrabarti

doi:10.1117/12.2209295

Translator Disclaimer

27 February 2016 Enhancement in optical and structural properties of Zn_0.85Mg_0.15O nanorods over thin films synthesized by hydrothermal chemical treatment

P. Murkute, N. Sehara, H. Ghadi, S. K. Pandey, S. Maity, S. Chakrabarti

Author Affiliations +

Proceedings Volume 9749, Oxide-based Materials and Devices VII; 974920 (2016) https://doi.org/10.1117/12.2209295
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

We are reporting an enhancement in optical properties by changing the structure of Zn_0.85Mg_0.15O thin films through formation of crystalline hexagonal nanorods. Zn_0.85Mg_0.15O thin films were deposited on Si (100) substrate using dielectric sputter followed by annealing in oxygen ambient at temperatures of 700, 800 and 900° C for 10 seconds to reduce oxygen vacancies defects. Deposited thin film annealed at 900 °C (sample A) measured highest peak intensity and it was subjected to controlled the hydrothermal bath conditioning for forming hexagonal nanorods. Four samples were dipped in 2 different solutions with variable molar ratio of zinc nitrate hexahydrate and hexamethylentetramine for 2 and 3 hours, respectively. Samples processed in solution 1 (1:1) ratio for 2 and 3 hours were named B and C and those in solution 2 (2:1) were D and E, respectively. Photoluminescence measurement at 18K demonstrates exciton near-band-edge (NBE) emission peak at 3.61eV from Zn_0.85Mg_0.15O sample A whereas other samples exhibited slight blue shift along with bimodal peaks. The other peak observed at lower energy 3.43eV corresponds to transitions due to presence of ZnO phase in Zn_0.85Mg_0.15O. All samples compared to sample A exhibited more than 10 times increment in peak intensities with sample B producing the highest (~ 20 times). Nanorods formation was confirmed using crosssectional SEM imaging. X-ray diffraction measurements revealed that all Zn_0.85Mg_0.15O samples had (002) preferred crystal orientation with peak position at 34.7°. All nanorods samples measured lower reflectance compared to sample A, indicating high absorption in nanorods due to high scattering of light at the nanorods surface.

Citation Download Citation

P. Murkute, N. Sehara, H. Ghadi, S. K. Pandey, S. Maity, and S. Chakrabarti "Enhancement in optical and structural properties of Zn_0.85Mg_0.15O nanorods over thin films synthesized by hydrothermal chemical treatment", Proc. SPIE 9749, Oxide-based Materials and Devices VII, 974920 (27 February 2016); https://doi.org/10.1117/12.2209295

ACCESS THE FULL ARTICLE