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Microstructural and Microchemical Characterisation of CuInSe2 Ingots Grown by the Vertical Bridgman Technique

  • C. A. Mullan (a1), S. M. Casey (a1), C. Jones (a1), C. J. Kiely (a1), M. Imanieh (a2) and R. D. Tomlinson (a2)...

Abstract

The microstructure and microchemistry of a number of melt textured CuInSe2 ingots prepared from a variety of starting charge compositions have been investigated using a combination of TEM, EPMA and Auger spectroscopy. If a stoichiometric starting mixture is used, In-rich and Cu-rich precipitates are found at the first and last to freeze zones of the ingot respectively, accompanied by an intervening mid-portion of inclusion free (although slightly off-stoichiometry) CuInSe2 We have found that in order to achieve an optimum matrix composition, a Cu-rich charge is required; however, this leads to a fine distribution of copper selenide particles throughout the ingot. If the starting charge is In-rich, then the boule contains In-rich precipitates and the matrix composition is In-rich and Cu-deficient. These observations are correlated with the observed electrical characteristics of the boules.

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Microstructural and Microchemical Characterisation of CuInSe2 Ingots Grown by the Vertical Bridgman Technique

  • C. A. Mullan (a1), S. M. Casey (a1), C. Jones (a1), C. J. Kiely (a1), M. Imanieh (a2) and R. D. Tomlinson (a2)...

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