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Effect of post deposited annealing ambience and temperature on the longer visible absorption of zinc oxide films

Publication Type : Conference Proceedings

Source : IOP Conference Series: Materials Science and Engineering

Url : https://iopscience.iop.org/article/10.1088/1757-899X/577/1/012139

Campus : Amritapuri

School : School of Arts and Sciences, School of Engineering, School of Physical Sciences

Department : Physics

Year : 2019

Abstract : Zinc oxide films were deposited on heated glass substrates at different substrate temperature 450°C and 500°C. After the deposition, some samples were heat treated at 500°C for one hour in air and some samples in vacuum for one hour at the same temperature. Absorbance analysis revealed that as deposited samples and post heat treated samples are showing intense absorption near 1.5eV apart from that corresponding to band gap of ZnO. The absorption coefficient variation with incident energy for the samples annealed in vacuum after deposition at 450° suggested the presence of oxygen vacancy as the native defect for the absorption near 1.5eV. The absorption energy for the samples obtained from (αhν)2 vs energy plot suggested that same kind of defect may be present in all the samples and is around 1.53eV.

Cite this Research Publication : V Rakhesh , Aparna S Devan and Balakrishnan Shankar, Effect of post deposited annealing ambience and temperature on the longer visible absorption of zinc oxide films, IOP Conference Series: Materials Science and Engineering, 2019

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