Patent ID: 8394465

Claim:
A preparation method of an electroconductive copper patterning layer, comprising: (Step 1) preparing Cu 2 O precursor solution by dissolving a carboxyl copper compound expressed by the following Chemical FIG. 1 , or a copper salt and a carboxyl group-contained compound expressed by the following Chemical FIG. 2 into a solvent: (R 1 —COO) 2 Cu Chemical FIG. 1 where R1 is an alkyl group having a carbon number in the range from 1 to 18, R 1 —COOH Chemical FIG. 2 where R1 is an alkyl group having a carbon number in the range from 1 to 18, adding a weak reducing agent having a standard reduction potential in the range from −0.2 to −0.05 V into the Cu 2 O precursor solution to form Cu 2 O spherical assembly particles, each of which is formed by agglomerating a plurality of Cu 2 O fine particles that have an average diameter in the range from 1 to 100 nm and a standard deviation on the diameter in the range from 0 to 10%, the Cu 2 O spherical assembly particles having an average diameter in the range from 0.1 to 10 μm and a standard deviation on the diameter in the range from 0 to 40%, and preparing a dispersion solution of the Cu 2 O spherical assembly particles; (Step 2) forming a patterning layer by printing or filling the dispersion solution of the Cu 2 O spherical assembly particles to a substrate into a predetermined shape; and (Step 3) irradiating laser to the patterning layer to burn and interconnect the copper-based particles contained in the Cu 2 O spherical assembly particles patterning layer.