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Synthesis and characterization of CuInS thin film structures.

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Title: Synthesis and characterization of CuInS thin film structures.
Authors: Wochnik, Angela1, Heinzl, Christoph1 Christoph.Heinzl@cup.uni-muenchen.de, Auras, Florian1, Bein, Thomas1, Scheu, Christina1
Source: Journal of Materials Science. Feb2012, Vol. 47 Issue 4, p1669-1676. 8p. 3 Black and White Photographs, 4 Graphs.
Subjects: Chemical synthesis, Semiconductor characterization, Metallic films, Scanning electron microscopy, Transmission electron microscopy, Chalcopyrite
Abstract: CuInS2 is a promising semiconductor material for solar cell applications. Here we use a mild solvothermal synthesis route to prepare CuInS2 films with different thicknesses and morphologies on fluorine-doped tin oxide coated glass. The microstructure of the films is studied in detail by scanning electron microscopy and transmission electron microscopy (TEM) and associated analytical techniques. For further characterization, we apply X-ray diffraction and UV/Vis absorption spectroscopy. Two different films are synthesized using different reagent stoichiometries and thermal treatments. The thicker film (25 μm) consists of three different regions. Close to the substrate a 600 nm thick densely packed layer occurs, on which a 1 μm thick flaky structure is found. On top of this structure, microspheres are located which possess a size of about 3 μm and are composed of numerous flakes. The thinner film consists of a 200 nm thick densely packed layer and a net-like structure built of individual flakes as well. In both films, TEM reveals that the flakes are adjacent to 10 nm thin branch-like rods. Energy dispersive X-ray spectroscopy of the densely packed layers indicates a Cu-rich composition which suggests them to be a p-type semiconductor. The rods and the flakes show a stoichiometric composition. Due to its high surface area, the thinner film offers a promising morphology for solar cell applications based on the large available area for the separation of electron-hole pairs, when the material is combined with a suitable electron conductor. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%22">Journal of Materials Science</searchLink>. Feb2012, Vol. 47 Issue 4, p1669-1676. 8p. 3 Black and White Photographs, 4 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Chemical+synthesis%22">Chemical synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Semiconductor+characterization%22">Semiconductor characterization</searchLink><br /><searchLink fieldCode="DE" term="%22Metallic+films%22">Metallic films</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+electron+microscopy%22">Scanning electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Chalcopyrite%22">Chalcopyrite</searchLink>
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  Data: CuInS2 is a promising semiconductor material for solar cell applications. Here we use a mild solvothermal synthesis route to prepare CuInS2 films with different thicknesses and morphologies on fluorine-doped tin oxide coated glass. The microstructure of the films is studied in detail by scanning electron microscopy and transmission electron microscopy (TEM) and associated analytical techniques. For further characterization, we apply X-ray diffraction and UV/Vis absorption spectroscopy. Two different films are synthesized using different reagent stoichiometries and thermal treatments. The thicker film (25 μm) consists of three different regions. Close to the substrate a 600 nm thick densely packed layer occurs, on which a 1 μm thick flaky structure is found. On top of this structure, microspheres are located which possess a size of about 3 μm and are composed of numerous flakes. The thinner film consists of a 200 nm thick densely packed layer and a net-like structure built of individual flakes as well. In both films, TEM reveals that the flakes are adjacent to 10 nm thin branch-like rods. Energy dispersive X-ray spectroscopy of the densely packed layers indicates a Cu-rich composition which suggests them to be a p-type semiconductor. The rods and the flakes show a stoichiometric composition. Due to its high surface area, the thinner film offers a promising morphology for solar cell applications based on the large available area for the separation of electron-hole pairs, when the material is combined with a suitable electron conductor. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: Feb2012
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