Boubaker Polynomials Expansion Scheme (BPES) optimisation of copper tin sulfide ternary materials precursor's ratio-related properties

Morphological and optical properties of as-grown copper tin sulfide layered materials have been investigated using an original analytical protocol. Conjoint Band gap-Roughness optimality has been obtained for the particular value of the copper-to-tin ratio chi(opt), = [Cu(2+)]/[Sn(2+)] = 3.27 approximately. Regarding the optical, thermal and mechanical constraints of the use of similar materials, precursor mixture parameters have to be chosen before optimal performances are reached. In this context, the obtained value of the optimal copper-to-tin ratio in the precursor solution is proposed. This value could be an efficient guide to understanding these materials' epitaxial growth-deposition kinetics and optimizing mechanical resistance to damage and fatigue. (C) 2010 Elsevier B.V. All rights reserved.