20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

Zn(O,S) Thin Films Deposited by Pulse–DC Magnetron Sputtering for an Alternative Cd-Free Buffer Layer

20 May 2015, 14:00
3h 30m
Board: SUR-13
Poster presentation Surface, Interface and Thin Film Poster-1

Speaker

Mr Ekkaphop KETSOMBUN (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand, 10140)

Description

Zn(O,S) thin films were deposited on glass substrates using pulse DC magnetron sputtering for 60 minutes. The sputtering power was varied from 70 to 100 W with oxygen reactive gas from 0 to 5 sccm at a constant pulse frequency of 200 kHz at room temperature. The optical properties of Zn (O,S) thin films was characterized by using UV-Visible spectroscopy, the thickness and composition of films were analyzed by Dektak profile and electron probe microanalysis (EPMA). The morphology of films were characterized using atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). The transmittance of all specimens were higher than 80% in the wavelength between 300 nm to 900 nm. Optical band gap of Zn (O,S) thin films varied between 3.5 eV to 4.1 eV. The RMS roughness decreases from about 40 nm to about 15 nm when the sputtering power increase from 70 W to 100 W. The composition of Zn (O,S) thin film showed the increase of oxygen content when increasing oxygen reactive gas. The increase of oxygen content increased transmittance of the specimens. Also, the samples with low sputtering power condition contained higher atomic percentage of oxygen than those with high sputtering power. The composition of Zn(O,S) thin film for alternative Cd-free buffer layer can be varied using this proposed method.

Primary author

Mr Ekkaphop KETSOMBUN (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand, 10140)

Co-authors

Dr Chanwit Chityuttakan (Shanghai Shenke Photovoltaic Novel Material Ltd. Co, Shanghai, China, 201201) Dr Panita Chityuttakan (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand, 10140) Dr Tula Jutarosaga (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand, 10140)

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