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Thermodynamic pathway for the formation of SnSe and SnSe2 polycrystalline thin ...
Fernandes, P. A.; Sousa, M. G.; Salomé, P. M. P.; Leitão, J. P.; Cunha, A. F. daIn this work, tin selenide thin films (SnSex) were grown on soda lime glass substrates by selenization of dc magnetron sputtered Sn metallic precursors. Selenization was performed at maximum temperatures in the range 300 °C to 570 °C. The thickness and the composition of the films were analysed using step profilometry and energy dispersive spectroscopy, respectively. The films were structurally and optically in...
Growth and characterization of Cu2ZnSn(S,Se)4 thin films for solar cells
Salomé, P. M. P.; Malaquias, J.; Fernandes, P. A.; Ferreira, M. S.; Cunha, A. F. da; Leitão, J. P.; González, J. C.; Matinaga, F. M.Cu2ZnSnS4 (CZTS) and Cu2ZnSnSe4 (CZTSe) with their band gap energies around 1.45 eV and 1.0 eV, respectively, can be used as the absorber layer in thin film solar cells. By using a mixture of both compounds, Cu2ZnSn(S,Se)4 (CZTSSe), a band gap tuning may be possible. The latter material has already shown promising results such as solar cell efficiencies up to 10.1%. In this work, CZTSSe thin films were grown in...
Photoluminescence and electrical study of fluctuating potentials in Cu2ZnSnS4-b...
Leitão, J. P.; Santos, N. M.; Fernandes, P. A.; Salomé, P. M. P.; Cunha, A. F. da; González, J. C.; Ribeiro, G. M.; Matinaga, F. M.In this work, we investigated structural, morphological, electrical, and optical properties from a set of Cu2ZnSnS4 thin films grown by sulfurization of metallic precursors deposited on soda lime glass substrates coated with or without molybdenum. X-ray diffraction and Raman spectroscopy measurements revealed the formation of single-phase Cu2ZnSnS4 thin films. A good crystallinity and grain compactness of the f...
Study of optical and structural properties of Cu2ZnSnS4 thin films
Leitão, J. P.; Santos, N. M.; Fernandes, P. A.; Salomé, P. M. P.; Cunha, A. F. da; González, J. C.; Matinaga, F. M.Cu2ZnSnS4 is a promising semiconductor to be used as absorber in thin film solar cells. In this work, we investigated optical and structural properties of Cu2ZnSnS4 thin films grown by sulphurization of metallic precursors deposited on soda lime glass substrates. The crystalline phases were studied by X-ray diffraction measurements showing the presence of only the Cu2ZnSnS4 phase. The studied films were copper ...
Growth pressure dependence of Cu2ZnSnSe4 properties
Salomé, P. M. P.; Fernandes, P. A.; Cunha, A. F. da; Leitão, J. P.; Malaquias, J.; Weber, A.; González, J. C.; Silva, M. I. N. daIn this work, we show a set of growth conditions, for the two step process, with which the growth of CZTSe is successful and reproducible. The properties of the best CTZSe thin films grown by this method were examined by SEM/EDS, XRD, Raman scattering, AFM/EFM, transmittance and reflectance measurements, photoluminescence (PL) measurements and hot point probe. A broad emission band was observed in the photolumi...
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