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7 results on '"Kostova, Nina G."'

3. Chalcogenide Quaternary Cu2FeSnS4 Nanocrystals for Solar Cells: Explosive Character of Mechanochemical Synthesis and Environmental Challenge

Author

Universidad de Sevilla. Departamento de Química Inorgánica, European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER), Baláž, Peter, Baláž, Matej, Sayagués de Vega, María Jesús, Eliyas, Alexander, Kostova, Nina G., Dutková, Erika, Zorkovská, Anna, Kanuchová, Mária, Universidad de Sevilla. Departamento de Química Inorgánica, European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER), Baláž, Peter, Baláž, Matej, Sayagués de Vega, María Jesús, Eliyas, Alexander, Kostova, Nina G., Dutková, Erika, Zorkovská, Anna, and Kanuchová, Mária

Abstract

In this study we demonstrate the synthesis of quaternary semiconductor nanocrystals of stannite Cu2FeSnS4/rhodostannite Cu2FeSn3S8 (CFTS) via mechanochemical route using Cu, Fe, Sn and S elements as precursors in one-pot experiments. Methods of X-ray diffraction (XRD), nitrogen adsorption, high-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) were applied to characterize properties of the unique nanostructures. Mechanochemical route of synthesis induced new phenomena like explosive character of reaction, where three stages could be identified and the formation of nanostructures 5–10 nm in size. By using XPS method, Cu(I), Fe(II), Sn(IV) and S(-II) species were identified on the surface of CFTS. The value of optical band gap 1.27 eV is optimal for semiconductors applicable as absorbers in solar cells. The significant photocatalytic activity of the CFTS nanocrystals was also evidenced. The obtained results confirm the excellent properties of the quaternary semiconductor nanocrystals synthesized from earth-abundant elements.

Published
2017

4. Chalcogenide Quaternary Cu2FeSnS4 Nanocrystals for Solar Cells: Explosive Character of Mechanochemical Synthesis and Environmental Challenge

Author

Consejo Superior de Investigaciones Científicas (España), Slovak Research and Development Agency, Bulgarian National Science Fund, Baláž, Peter, Baláž, Matej, Sayagués, María Jesús, Eliyas, Alexander, Kostova, Nina G., Kanuchová, Mária, Dutková, Erika, Zorkovská, Anna, Consejo Superior de Investigaciones Científicas (España), Slovak Research and Development Agency, Bulgarian National Science Fund, Baláž, Peter, Baláž, Matej, Sayagués, María Jesús, Eliyas, Alexander, Kostova, Nina G., Kanuchová, Mária, Dutková, Erika, and Zorkovská, Anna

Abstract

In this study we demonstrate the synthesis of quaternary semiconductor nanocrystals of stannite Cu2FeSnS4/rhodostannite Cu2FeSn3S8 (CFTS) via mechanochemical route using Cu, Fe, Sn and S elements as precursors in one-pot experiments. Methods of X-ray diffraction (XRD), nitrogen adsorption, high-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) were applied to characterize properties of the unique nanostructures. Mechanochemical route of synthesis induced new phenomena like explosive character of reaction, where three stages could be identified and the formation of nanostructures 5–10 nm in size. By using XPS method, Cu(I), Fe(II), Sn(IV) and S(-II) species were identified on the surface of CFTS. The value of optical band gap 1.27 eV is optimal for semiconductors applicable as absorbers in solar cells. The significant photocatalytic activity of the CFTS nanocrystals was also evidenced. The obtained results confirm the excellent properties of the quaternary semiconductor nanocrystals synthesized from earth-abundant elements.

Published
2017

7. Chalcogenide Quaternary Cu2FeSnS4 Nanocrystals for Solar Cells: Explosive Character of Mechanochemical Synthesis and Environmental Challenge.

Author

Baláž, Peter, Baláž, Matej, Sayagués, María J., Eliyas, Alexander, Kostova, Nina G., Kaňnuchová, Mária, Dutková, Erika, and Zorkovská, Anna

Subjects
CHALCOGENIDE films, MECHANICAL chemistry
Abstract

In this study we demonstrate the synthesis of quaternary semiconductor nanocrystals of stannite Cu2FeSnS4/rhodostannite Cu2FeSn3S8 (CFTS) via mechanochemical route using Cu, Fe, Sn and S elements as precursors in one-pot experiments. Methods of X-ray diffraction (XRD), nitrogen adsorption, high-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) were applied to characterize properties of the unique nanostructures. Mechanochemical route of synthesis induced new phenomena like explosive character of reaction, where three stages could be identified and the formation of nanostructures 5&-10 nm in size. By using XPS method, Cu(I), Fe(II), Sn(IV) and S(-II) species were identified on the surface of CFTS. The value of optical band gap 1.27 eV is optimal for semiconductors applicable as absorbers in solar cells. The significant photocatalytic activity of the CFTS nanocrystals was also evidenced. The obtained results confirm the excellent properties of the quaternary semiconductor nanocrystals synthesized from earth-abundant elements. [ABSTRACT FROM AUTHOR]

Published
2017
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