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Determination of the energy band-gap of the ceramic ZnO -xTiO₂ using photopyroelectric spectroscopy


Zakaria, Azmi and Rizwan, Zahid and Mohd Ghazali, Mohd Sabri and Shaari, Abdul Halim and Mat Yunus, Wan Mahmood and Hashim, Mansor (2008) Determination of the energy band-gap of the ceramic ZnO -xTiO₂ using photopyroelectric spectroscopy. Solid State Science and Technology, 16 (1). pp. 85-92. ISSN 0128-7389


Photopyroelectric (PPE) spectroscopy is a useful tool for examining optical properties in semiconductor materials. The ceramic (ZnO - xTiO₂) was sintered at 1270⁰C for 1 and 3 hours to investigate the variations of energy band-gap with respect to mol % of dopant TiO₂. The X-ray diffractrometry shows that the crystal structure of ZnO doped at low level remains to be of hexagonal type but has developed second phase, Zn₂TiO₄, at high level. Microstructure and compositional analysis of the selected areas are analyzed using SEM and EDAX. The maximum grain size obtained were 26.8, 52.4 µm at 0.4 mol % of TiO₂ for 1 and 3 hours sintering time, respectively. The band-gap determined from the photopyroelectric spectrum has the value of 2.82 ± 0.01 eV for samples sintered for 1 and 3 hours at the doping level of 0.4 mol % of TiO₂ and decreases with the increase of TiO₂.

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Official URL or Download Paper: http://journal.masshp.net/volume-16-no-1-2008/

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Malaysian Solid State Science and Technology Society
Keywords: Photopyroelectric spectroscopy; Energy band-gap; Ceramic ZnO -xTiO2; Semiconductor material
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 18 Jun 2015 03:33
Last Modified: 26 Nov 2015 03:36
URI: http://psasir.upm.edu.my/id/eprint/13963
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