Journal
THIN SOLID FILMS
Volume 361, Issue -, Pages 161-166Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0040-6090(99)00777-4
Keywords
Cu(In,Ga)Se(2); growth; sodium; selenium; surface; oxidation
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We investigate the influence of Na on the growth of Cu(In,Ga)Se(2) thin-films by three model experiments. First, we examine the influence of Na on the Se activity during selenisation of Mo films on soda-lime and borosilicate glass after growth and after thermal treatments. Second, we analyse the location and possible binding partners of Na in polycrystalline Cu(ln,Ga)Se2 prior to and after air-exposure. The final experiment focuses on the identification of the chemical state of Na on the surface of as grown and air-exposed films. Our experiments demonstrate that Na influences the growth of CIGS Cu(ln,Ga)Se(2) due to its interaction with Se. in non-air-exposed films Na is mainly localised in the form of sodium-polyselenides (Na(2)Se(x)) at the grain boundaries. We conclude that Na(2)Se(x) acts as Se-reservoir during film formation and oxidation. (C) 2000 Elsevier Science S.A. All rights reserved.
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