Effect of oxygen pressure on the structural and optical properties of BaSnO3 films prepared by pulsed laser deposition method.

John, Jibi; Chalana, S.R.; Prabhu, Radhakrishna; Pillai, V.P. Mahadevan

Abstract

BaSnO3 thin films were deposited on quartz substrate by pulsed laser deposition technique under different background oxygen pressures and the effects of oxygen pressure on the structural, morphological and optical properties of BaSnO3 thin films are systematically investigated using different characterization techniques. The BaSnO3 films deposited without and with oxygen pressures are polycrystalline in nature with cubic crystalline phase. Moderate oxygen ambience favors enhanced crystallinity of the BaSnO3 films and 0.02 mbar is found to be optimum oxygen pressure for highest crystallinity. The surface morphology of the deposited films was strongly affected by the oxygen pressure in the deposition chamber. A systematic increase of film thickness and decrease of RMS surface roughness is observed with increase in oxygen pressure. XPS analysis reveals that barium is in the + 2 oxidation state and Sn is in the + 4 oxidation state in the film deposited at optimum oxygen pressure of 0.02 mbar. The deposited BaSnO3 films have photoluminescence emissions in the visible region and have high transmittance in the visible and infrared regions. The BaSnO3 films deposited at oxygen ambience shows a blue shift in the optical band gap. The optimized film shows high crystallinity, high value of transmittance and wide band gap energy which indicates its suitability for optoelectronic devices.

Citation

JOHN, J., CHALANA, S.R., PRABHU, R. and PILLAI, V.P.M. 2019. Effect of oxygen pressure on the structural and optical properties of BaSnO3 films prepared by pulsed laser deposition method. Applied physics A: materials science and processing [online], 123(3), article 155. Available from: https://doi.org/10.1007/s00339-019-2432-0

• Journal Article Type: Article
• Acceptance Date: Jan 22, 2019
• Online Publication Date: Feb 4, 2019
• Publication Date: Mar 31, 2019
• Deposit Date: Apr 4, 2019
• Publicly Available Date: Feb 5, 2020
• Journal: Applied physics A: materials science and processing
• Print ISSN: 0947-8396
• Electronic ISSN: 1432-0630
• Publisher: Springer
• Peer Reviewed: Peer Reviewed
• Volume: 125
• Issue: 3
• Article Number: 155
• DOI: https://doi.org/10.1007/s00339-019-2432-0
• Keywords: BaSnO3 films; Oxygen pressure; Optoelectronic applications
• Public URL: http://hdl.handle.net/10059/3327