fatma chaabouni | Ecole Nationale d'Ingénieurs de Tunis (ENIT) (original) (raw)
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Papers by fatma chaabouni
Applied Physics A
This work contributes to the discussion on the influence of the back contact on the electrical pr... more This work contributes to the discussion on the influence of the back contact on the electrical properties of Cu2ZnSnS4 (CZTS) based solar cells. Devices with noble metals back contact (Au, Ag and Pt) such as FTO/ZnS/CZTS/Au, FTO/ZnS/CZTS/Pt and FTO/ZnS/CZTS/Ag were investigated by means of the current voltage characteristic in the dark (FTO = fluorine-doped tin oxide). The originality of this work is that all active layers (absorbing and buffer layers) are deposited by the same system using spray pyrolysis technique. The metallic back contacts are sputter deposited. X-ray diffraction (XRD) and UV-visible spectrophotometry were used to investigate the main structural and optical properties of different layers constituting the solar cell. The electrical characterization achieved by I-V characteristic proves that all synthesized heterojunctions exhibit a rectifying behavior. Furthermore, the ideality factors of Au, Pt and Ag back contacts were estimated to 1.6, 2.4 and 2.8, respectively. The lower saturation current and series resistance are measured in the heterojunction using Au as a back contact. From this study, it is shown that Au back contact could be an alternative of Mo in CZTS based solar cell prepared by spray pyrolysis.
Sensors
Pure and dysprosium-loaded ZnO films were grown by radio-frequency magnetron sputtering. The film... more Pure and dysprosium-loaded ZnO films were grown by radio-frequency magnetron sputtering. The films were characterized using a wide variety of morphological, compositional, optical, and electrical techniques. The crystalline structure, surface homogeneity, and bandgap energies were studied in detail for the developed nanocomposites. The properties of pure and dysprosium-doped ZnO thin films were investigated to detect nitrogen dioxide (NO2) at the ppb range. In particular, ZnO sensors doped with rare-earth materials have been demonstrated as a feasible strategy to improve the sensitivity in comparison to their pure ZnO counterparts. In addition, the sensing performance was studied and discussed under dry and humid environments, revealing noteworthy stability and reliability under different experimental conditions. In this perspective, additional gaseous compounds such as ammonia and ethanol were measured, resulting in extremely low sensing responses. Therefore, the gas-sensing mechan...
THE Coatings, 2020
The direct synthesis of chalcopyrite Cu2MnSnS4 (CMTS) thin films by a spray pyrolysis technique o... more The direct synthesis of chalcopyrite Cu2MnSnS4 (CMTS) thin films by a spray pyrolysis technique on glass substrates under oxidative conditions (ambient atmosphere and using compressed air as a carrier gas instead of nitrogen) was studied. The effect of the deposition temperature on the structural, chemical composition, and optical and electrical properties of thin films has been assessed. X-ray diffraction study reveals that the tetragonal stannite structure crystallizes with a [112] preferential orientation from 280 up to 360 °C, with its crystallinity correlated with the substrate temperature. However, in addition to its crystallization, traces of secondary phases are observed: a mixture of SnO and CuO at 360 °C prevails on the formation of CuS at 320 °C. Above 360 °C, the oxidant conditions combined with the loss in sulfur lead to the crystallization of only the tenorite CuO. The crystallization of sulfides by spray pyrolysis under air is possible only at relatively low depositio...
Applied Physics A
This work contributes to the discussion on the influence of the back contact on the electrical pr... more This work contributes to the discussion on the influence of the back contact on the electrical properties of Cu2ZnSnS4 (CZTS) based solar cells. Devices with noble metals back contact (Au, Ag and Pt) such as FTO/ZnS/CZTS/Au, FTO/ZnS/CZTS/Pt and FTO/ZnS/CZTS/Ag were investigated by means of the current voltage characteristic in the dark (FTO = fluorine-doped tin oxide). The originality of this work is that all active layers (absorbing and buffer layers) are deposited by the same system using spray pyrolysis technique. The metallic back contacts are sputter deposited. X-ray diffraction (XRD) and UV-visible spectrophotometry were used to investigate the main structural and optical properties of different layers constituting the solar cell. The electrical characterization achieved by I-V characteristic proves that all synthesized heterojunctions exhibit a rectifying behavior. Furthermore, the ideality factors of Au, Pt and Ag back contacts were estimated to 1.6, 2.4 and 2.8, respectively. The lower saturation current and series resistance are measured in the heterojunction using Au as a back contact. From this study, it is shown that Au back contact could be an alternative of Mo in CZTS based solar cell prepared by spray pyrolysis.
Sensors
Pure and dysprosium-loaded ZnO films were grown by radio-frequency magnetron sputtering. The film... more Pure and dysprosium-loaded ZnO films were grown by radio-frequency magnetron sputtering. The films were characterized using a wide variety of morphological, compositional, optical, and electrical techniques. The crystalline structure, surface homogeneity, and bandgap energies were studied in detail for the developed nanocomposites. The properties of pure and dysprosium-doped ZnO thin films were investigated to detect nitrogen dioxide (NO2) at the ppb range. In particular, ZnO sensors doped with rare-earth materials have been demonstrated as a feasible strategy to improve the sensitivity in comparison to their pure ZnO counterparts. In addition, the sensing performance was studied and discussed under dry and humid environments, revealing noteworthy stability and reliability under different experimental conditions. In this perspective, additional gaseous compounds such as ammonia and ethanol were measured, resulting in extremely low sensing responses. Therefore, the gas-sensing mechan...
THE Coatings, 2020
The direct synthesis of chalcopyrite Cu2MnSnS4 (CMTS) thin films by a spray pyrolysis technique o... more The direct synthesis of chalcopyrite Cu2MnSnS4 (CMTS) thin films by a spray pyrolysis technique on glass substrates under oxidative conditions (ambient atmosphere and using compressed air as a carrier gas instead of nitrogen) was studied. The effect of the deposition temperature on the structural, chemical composition, and optical and electrical properties of thin films has been assessed. X-ray diffraction study reveals that the tetragonal stannite structure crystallizes with a [112] preferential orientation from 280 up to 360 °C, with its crystallinity correlated with the substrate temperature. However, in addition to its crystallization, traces of secondary phases are observed: a mixture of SnO and CuO at 360 °C prevails on the formation of CuS at 320 °C. Above 360 °C, the oxidant conditions combined with the loss in sulfur lead to the crystallization of only the tenorite CuO. The crystallization of sulfides by spray pyrolysis under air is possible only at relatively low depositio...