Elaboration and characterization, of Ba-Sn-O system, by chemical
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Date
2024-03-10
Journal Title
Journal ISSN
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Publisher
Université 20 août 1955-Skikda
Abstract
The effect of the substitution of barium by calcium and tin by lead on structural, optical and
luminescence properties of spray deposited barium tin oxide films onto glass substrates was
studied in this work, as a function of the calcium-based solution volume ratio RCa and leadbased solution volume ratio RPb. The structural, optical and photoluminescence properties of
deposited barium-calcium tin oxide films were characterized by x-ray diffraction (XRD), UVvisible spectroscopy and photoluminescence spectroscopy (PL), respectively. Measurement of
the films thickness has been also done. All experiments were done at a substrate temperature
of 500°C. According to x-ray diffraction (XRD) patterns, the substitution of barium by
calcium induced an indirect phase transition from Ba3SnO to Ca3SnO which is the same result
for the substitution of tin by lead during the transition to Ba3PbO. Metastable phases were
identified for both series of samples. As a function of RCa, the mean transmittance, in the
visible domain, increased from 50 to 80% while the band gap energy decreased from 3.14 to
3.09 eV. PL spectra revealed that the substitution of barium by calcium and the substitution of
tin by lead increased the concentration of double ionized oxygen vacancies (VO++). The
semiconducting behavior and the presence of defects made the deposited films promising
materials for optoelectronics, gas sensing and photovoltaic conversion devices.