ETCHING COMPOSITION FOR PATTERNED METAL LAYER

摘要

The present invention relates to an etchant composition for a patterned metal layer used to manufacture an ultrathin layer liquid display device (TFT-LCD). The etchant composition for the patterned metal layer comprises: hydrogen peroxide as a main oxidant; and an organic composition or an inorganic composition containing one or more ions or the one or more ions selected from Ag, Fe, Cu, Ni, Mn, and Ce as an auxiliary oxidant. According to the present invention, the etchant composition forms a pixel electrode of a fine pattern at a rapid speed by improving an etchant speed using the auxiliary oxidant. Moreover, the etchant composition improves productivity by reducing a generation of a precipitate even if a number of processing is increased as the etchant composition improves solubility of a metal ion using a precipitation prevention agent.