Patent ID: 9741827
Date: 2017-08-22
CPC Classifications: C23F,H01L

Claim:
1. A method of manufacturing a display device, the method comprising: forming a gate metal layer including an upper gate metal layer and a lower gate metal layer on an insulating substrate; etching the gate metal layer with an etchant to form a gate line including a gate electrode; forming a gate insulating layer on the gate line; forming on the gate insulating layer a first amorphous silicon layer, a second amorphous silicon layer, a lower data metal layer, and an upper data metal layer sequentially; etching the first amorphous silicon layer, the second amorphous silicon layer, the lower data metal layer, and the upper data metal layer to form a semiconductor layer, a resistive contact layer, a data line including a source electrode, and a drain electrode; forming a protective layer on the data line, the drain electrode, and the gate insulating layer; and forming on the protective layer a pixel electrode that is connected with the drain electrode, wherein the etchant comprises; a persulfate from about 0.5 wt % to about 20 wt %; a fluoride compound from about 0.01 wt % to about 2 wt %; an inorganic acid from about 1 wt % to about 10 wt %; a N (nitrogen atom)-containing heterocyclic compound from about 0.5 wt % to about 5 wt %; wherein the N-containing heterocyclic compound comprises at least one selected from the group consisting of 3-amino-1,2,4-triazole, 4H-1,2,4-triazol-4-amine, and benzotriazole; a chloride compound from about 0.1 wt % to about 5 wt %; a copper salt from about 0.05 wt % to about 3 wt %; an organic acid or an organic acid salt from about 0.1 wt % to about 10 wt %; an electron-donating compound from about 0.1 wt % to about 5 wt %; wherein the electron donating compound comprises at least one selected from the group consisting of N-acetyl L-cysteine, and L-methionine; and a potassium salt, a sodium salt, and an ammonium salt of N-acetyl L-cysteine, and L-methionine; and a residual amount of solvent.