Search

Your search keyword '"Herrero, J."' showing total 89 results
Start Over Author "Herrero, J." Journal thin solid films
89 results on '"Herrero, J."'

43. Characteristics of stacked CuInS2 and CuGaS2 layers as determined by the growth sequence

Author

Guillén, C. and Herrero, J.

Subjects
*THIN films, *SPECTRUM analysis, *ELECTRON spectroscopy, *PHOTOELECTRON spectroscopy
Abstract

Abstract: CuInS2 and CuGaS2 thin films have been prepared sequentially from elemental evaporation sources onto conventional soda lime glass substrates heated at 350 °C during the deposition process. The gradient in the structure and composition of the stacked layers has been investigated for the two possible growth sequences. Structural depth profiling and crystallographic phase analysis were performed by grazing incidence X-ray diffraction. The atomic distribution in the films depth was analyzed by X-ray photoelectron spectroscopy combined with sputter etching. Formation of the quaternary compound CuIn1− x Ga x S2, with a high Ga content x >0.80, has been detected with different distribution depending on the growth sequence. [Copyright &y& Elsevier]

Published
2007
Full Text
View/download PDF

44. Structure, morphology and optical properties of CuInS2 thin films prepared by modulated flux deposition

Author

Guillén, C., Herrero, J., Gutiérrez, M.T., and Briones, F.

Subjects
*THIN films, *POLYCRYSTALS, *COPPER compounds, *PHOTOVOLTAIC cells
Abstract

Abstract: The structure, morphology and optical properties of copper indium sulfide thin films prepared by a novel modulated flux deposition procedure have been investigated for layers from 200 to 400 nm thickness. These polycrystalline CuInS2 films grown onto glass substrates showed CuAu-like structure, similar to epitaxial CuInS2 films grown onto monocrystalline substrates, and direct band gap values Eg=1.52–1.55 eV, optimum for single-junction photovoltaic applications. The increase in the layer thickness leads to growth of the average crystallite size and increases slightly the surface roughness and the absorption coefficient. [Copyright &y& Elsevier]

Published
2005
Full Text
View/download PDF

45. SnO2substrate effects on the morphology and composition of chemical bath deposited ZnSe thin films

Author

Chaparro, A.M., Martı́nez, M.A., Guillén, C., Bayón, R., Gutiérrez, M.T., and Herrero, J.

Abstract

ZnSe thin films are deposited by the chemical bath deposition (CBD) method onto different glass and SnO2coated glass substrates. Three SnO2substrates with different grain size, roughness, conductivity and optical transmission are used. The roughness of the surfaces increases after CBD deposition of ca 0. l μm thick ZnSe films and further upon heating at 200°C due to recrystallisation of the deposit. This effect seems more intense the bigger the grain size of the SnO2substrate. Above 400°C annealing temperature, the roughness of the films diminishes below that of bare SnO2substrates, after conversion of ZnSe into a ZnO film. For films deposited on glass substrates, the annealing process gives rise to the roughest surfaces, due to a weaker film-substrate interaction and more important recrystallisation. The optical characterisation shows a decrease in the integral transmittance by about 15% for all the substrates studied after deposition of the ZnSe film. On the glass substrate, the annealing treatment shifts the absorption edge to longer wavelengths reflecting the important recrystallisation. This effect does not take place with SnO2substrate due to the better crystallinity of the initial film and the stronger film-substrate interaction. Transmittance increases after annealing at 400°C due to the formation of the ZnO film. Compositional analysis by XPS shows that films are composed of a mixture of ZnSe and ZnO, the proportion differing among substrates. In general, films deposited on SnO2have higher proportion of ZnO than on glass substrate. We attribute this effect to differences in the chemical deposition process induced by the substrate surface.

Published
2000
Full Text
View/download PDF

50. Comparative study of In2S3-ITO bilayers deposited on glass and different plastic substrates

Author

Asenjo, B., Guillén, C., Herrero, J., and Gutiérrez, M.T.

Subjects
*INDIUM compounds, *OPTICAL properties, *THIN films, *VAPOR-plating, *SUBSTRATES (Materials science), *GLASS, *POLYETHYLENE terephthalate, *COMPARATIVE studies, *X-ray diffraction
Abstract

Abstract: In this work ITO thin films have been grown onto glass, polyethylene terephthalate (PET) and Arylite polymer substrates by sputtering at room temperature. The In2S3 films were chemically deposited on ITO during different times, forming bilayers for subsequent photovoltaic applications. Optical properties of the films were investigated from the transmittance and the structural properties by XRD. Transmittance of the films varies with deposition time and the different substrates used, the same as the adherence and the homogeneity of the films. [Copyright &y& Elsevier]

Published
2009
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results