https://doi.org/10.1140/epjd/s10053-022-00462-y
Regular Article – Optical Phenomena and Photonics
Evaluating the impact of substrate deposition on optical properties of perovskite barium strontium titanate (Ba0.5Sr0.5TiO3) thin films prepared by pulsed laser deposition technique
1
Directorate of Education in Dhi Qar, Al-Mustaqbal University College, Hillah, Iraq
2
Department of Medical Physics, Al-Mustaqbal University College, Hillah, Iraq
a hamed.alwan@alayen.edu.iq, hamedalwan14@gmail.com
Received:
4
February
2022
Accepted:
19
July
2022
Published online:
25
August
2022
This study used pulsed laser deposition (PLD) technique to produce thin films of barium strontium titanate (Ba0.5Sr0.5TiO3 or BST) on fused quartz substrates at various substrate temperatures. BST target was prepared by solid-state reaction, and the optical parameters of Ba0.5Sr0.5TiO3 thin films were investigated. X-ray diffraction (XRD) analysis showed that polycrystalline and perovskite formation occurred at 700 °C. The grain growth was enhanced at a higher deposition temperature. Moreover, deposition temperature had an effect on the lattice parameter, and pure Ba0.5Sr0.5TiO3 films had lower packing density and higher surface roughness at higher deposition temperatures. As the wavelength changed from the infrared region to the visible region, the range of refractive index raised from 2.16 to 2.35. Furthermore, BST films deposited on fused quartz had an indirect transition, and the value of the optical energy gap was around 3.46 eV. Finally, Ba0.5Sr0.5TiO3 showed a relative decrease in ad-molecule sticking coefficient at a 400–700 °C.
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