Preparation of covellite and digenite thin films by an intermittent spray pyrolysis deposition method

Madarász, János and Okuya, M. and Kaneko, S. (2001) Preparation of covellite and digenite thin films by an intermittent spray pyrolysis deposition method. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 21 (10-11). pp. 2113-2116. ISSN 0955-2219

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Abstract

Intermittent spray pyrolysis of 0.01-0.20 M aqueous solutions of CuCl (dissolved in the presence of 3-fold molar amount of thiourea) onto a heated alkali-free glass substrate in air already at 225-275 degreesC resulted in various thin films of CuS (covellite) and/or Cu(1.8)s (Cu9S5, digenite). A combination of low pyrolysis temperatures (225-250 degreesC) and low solution concentrations (0.01-0.02 M) has resulted in the formation of thin solid CuS films. At a pyrolysis temperature of 275 degreesC Cu1.8S films have been obtained. The higher concentration range (0.05-0.20 M) has been found favorable for simultaneous formation of Cu1.8S and CuS. In the two-phase layers the crystal growth of CuS has seemed to be limited, whilst the growth of Cu1.8S has been preferentially favored especially on its (0 0 15) lattice plane. (C) 2001 Elsevier Science Ltd. All rights reserved.

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