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https://doi.org/10.1016/j.actamat.2012.08.043
Title: | Heat-field-stimulated decomposition reaction in Cu 2ZnSnS 4 | Authors: | Yin, X. Gong, H. |
Keywords: | CZTS Decomposition Kinetic analysis Phase stability Thermal effects |
Issue Date: | Nov-2012 | Citation: | Yin, X., Gong, H. (2012-11). Heat-field-stimulated decomposition reaction in Cu 2ZnSnS 4. Acta Materialia 60 (19) : 6732-6741. ScholarBank@NUS Repository. https://doi.org/10.1016/j.actamat.2012.08.043 | Abstract: | Thermal stability is essential for the potential solar cell material Cu 2ZnSnS 4 (CZTS) in achieving a satisfactory photovoltaic device performance. Although the loss of Sn from CZTS has been reported, the basic decomposition mechanism of a CZTS system has not been well established yet, especially with regard to the role of active Cu 1+ ions. This paper not only provides a deeper understanding of the change of Sn species, which includes an equimolar-isobaric vaporization mode transition and a solid-vapor phase transition in a self-generated atmosphere, but also reveals the oxidation state alternation (Cu 1+/Cu 2+) and transfer mechanism of Cu species through carefully designed experiments and a reaction kinetic study. Cu ions are unexpectedly found to be active in affecting the degradation reaction by valance alternation and ion movement upon the application of a heat field to balance the derivation caused by a non-uniform temperature gradient. As a result, a Cu-Zn separation appears, with Cu accumulating near the hot area and Zn near the cold area. A decomposition reaction model of CZTS under a directional heat field is proposed to describe the elemental and electronic state change in atomic scale, and a perfect match is obtained between the model and the experimental results. This paper paves a way to solve the thermal stability issue of Cu 2ZnSnS 4. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. | Source Title: | Acta Materialia | URI: | http://scholarbank.nus.edu.sg/handle/10635/86384 | ISSN: | 13596454 | DOI: | 10.1016/j.actamat.2012.08.043 |
Appears in Collections: | Staff Publications |
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