Etching solution for multiple layer of copper and molybdenum and etching method using the same
View Patent ↗An etching solution for a multiple layer of copper and molybdenum includes: about 5% to about 30% by weight of a hydrogen peroxide; about 0.5% to about 5% by weight of an organic acid; about 0.2% to about 5% by weight of a phosphate; about 0.2% to about 5% by weight of a first additive having nitrogen; about 0.2% to about 5% by weight of a second additive having nitrogen; about 0.01% to about 1.0% by weight of a fluoric compound; and de-ionized water making a total amount of the etching solution 100% by weight.
1. An etching solution for a multiple layer of a lower molybdenum layer and an upper copper layer, comprising:
about 5% to about 30% by weight of a hydrogen peroxide;
about 0.5% to about 5% by weight of an organic acid;
about 0.2% to about 5% by weight of a phosphate;
about 0.2% to about 5% by weight of a first additive having nitrogen;
about 0.2% to about 5% by weight of a second additive having nitrogen;
about 0.01% to about 1.0% by weight of a fluoric compound; and
de-ionized water making a total amount of the etching solution 100% by weight.
2. The etching solution according to claim 1 , wherein the organic acid is water-soluble.
3. The etching solution according to claim 2 , wherein the organic acid is selected from the group consisting of acetic acid, butanoic acid, citric acid, formic acid, gluconic acid, glycolic acid, malonic acid, oxalic acid and pentanoic acid.
4. The etching solution according to claim 1 , wherein the phosphate is a salt obtained by substituting at least one hydrogen of phosphoric acid with one of alkali metal and alkaline earth metal.
5. The etching solution according to claim 4 , wherein the phosphate is selected from the group consisting of sodium dihydrogen phosphate and potassium dihydrogen phosphate.
6. The etching solution according to claim 1 , wherein the first additive is a water-soluble cyclic amine compound.
7. The etching solution according to claim 6 , wherein the first additive is selected from the group consisting of aminotetrazole, imidazole, indole, purine, pyrazole, pyridine, pyrimidine, pyrrole, pyrrolidine, pyrroline.
8. The etching solution according to claim 1 , wherein the second additive is a water-soluble compound including one of amino group and carboxyl group.
9. The etching solution according to claim 8 , wherein the second additive is selected from the group consisting of alanine, aminobutyric acid, glutamic acid, glycine, iminodiacetic acid, nitrilotriacetic acid, sarcosine and their derivatives.
10. The etching solution according to claim 1 , wherein the fluoric compound is capable of being dissociated into one of fluoric ion and polyatomic fluoric ion in the etching solution.
11. The etching solution according to claim 10 , wherein the second additive is selected from the group consisting of ammonium fluoride, sodium fluoride, potassium fluoride, ammonium bifluoride, sodium bifluoride and potassium bifluoride.
12. A composition for etching a multiple layer of copper and molybdenum, comprising:
about 5% to about 30% by weight of a hydrogen peroxide;
about 0.5% to about 5% by weight of an organic acid;
about 0.2% to about 5% by weight of a phosphate;
about 0.2% to about 5% by weight of a first additive having nitrogen;
about 0.2% to about 5% by weight of a second additive having nitrogen;
about 0.01% to about 1.0% by weight of a fluoric compound; and
about 45% to about 93.89% by weight of de-ionized water.
13. The composition according to claim 12 , wherein the organic acid controls a pH value of the composition.
14. The composition according to claim 12 , wherein the phosphate reduces an electric effect between copper and molybdenum.
15. The composition according to claim 12 , wherein the first additive controls an etch speed of the composition.
16. The composition according to claim 12 , wherein the second additive reduces a self-decomposition reaction of the hydrogen peroxide.
17. The composition according to claim 12 , wherein the second additive reduces activation of copper and molybdenum ions.
18. The composition according to claim 12 , wherein the fluoric acid removes molybdenum residues.