Manufacturing method of electro line for liquid crystal display device

1. A manufacturing method of an electro line for a liquid crystal display device, comprising:

depositing a barrier layer on a substrate;

depositing a copper layer (Cu) on the barrier layer deposited on the substrate;

forming a photoresist pattern on the Cu layer;

wet-etching only the Cu layer with the photoresist pattern as an etching mask using a first etchant; and

dry-etching the barrier layer using a second etchant, wherein the wet-etched Cu layer is used as an etch mask and the barrier layer is patterned based upon outer edges of the wet-etched Cu layer, wherein the dry-etched barrier layer has a same shape as the wet-etched Cu layer.

2. The method according to claim 1 , wherein the first etchant includes 2KHSO 5 ·K 2 SO 4 ·KHSO 4 .

3. The method according to claim 2 , wherein the 2KHSO 5 ·K 2 SO 4 ·KHSO 4 has a concentration within a range of about 1 wt. % to about 20 wt. %.

4. The method according to claim 1 , wherein the second etchant includes a chlorine gas (Cl 2 ) and an oxygen gas (O 2 ).

5. The method according to claim 4 , wherein flow rates of the chlorine gas (Cl 2 ) and the oxygen gas (O 2 ) are about 200 sccm and about 200 sccm, respectively.

6. The method according to claim 4 , wherein the dry-etching the barrier layer is accomplished under a pressure of about 250 mTorr.

7. The method according to claim 6 , wherein the dry-etching the barrier layer is accomplished under an electric power of about 800 W.

8. The method according to claim 4 , wherein an etch rate of the barrier layer is about 1,000 Å/mm.

9. The method according to claim 1 , wherein the barrier layer includes one of molybdenum (Mo) and chromium (Cr).

10. The method according to claim 1 , wherein the barrier layer has strong chemical corrosion resistance and is etched with a dry-etching material that does not etch materials including silicon.

11. A manufacturing method of an electro line for a liquid crystal display device, comprising:

depositing a barrier layer on a substrate;

depositing a copper layer (Cu) on the barrier layer;

forming a photoresist pattern on the Cu layer;

wet-etching the Cu layer with the photoresist pattern as an etching mask using a first etchant; and

dry-etching the barrier layer using a second etchant, wherein the first etchant includes 2KHSO 5 ·K 2 SO 4 ·KHSO 4 , and wherein the barrier layer is patterned based upon outer edges of the wet-etched Cu layer.

12. The method according to claim 11 , wherein the 2KHSO 5 ·K 2 SO 4 ·KHSO 4 has a concentration within a range of about 1 wt. % to 20 wt. %.

13. The method according to claim 11 , wherein the second etchant includes a chlorine gas (Cl 2 ) and an oxygen gas (O 2 ).

14. The method according to claim 13 , wherein flow rates of the chlorine gas (Cl2) and the oxygen gas (O2) are about 200 sccm each.

15. The method according to claim 13 , wherein the dry-etching of the barrier layer is accomplished under a pressure of about 250 mTorr.

16. The method according to claim 15 , wherein the dry-etching of the barrier layer is accomplished under an electric power of about 800 W.

17. The method according to claim 13 , wherein an etch rate of the barrier layer is about 1,000 Å/mm.

18. The method according to claim 11 , wherein the barrier layer includes one of molybdenum (Mo) and chromium (Cr).

19. The method according to claim 11 , wherein the barrier layer has strong chemical corrosion resistance and is etched with a dry-etching material that does not etch materials including silicon.

20. A manufacturing method of an electro line for a liquid crystal display device, comprising:

sequentially depositing a barrier layer and a Cu layer on a substrate; and

forming a photoresist pattern on the Cu layer;

forming an electro line by sequentially etching only the Cu layer with the photoresist pattern as an etching mask and then the barrier layer, wherein the barrier layer is patterned based upon outer edges of the Cu layer

wherein the Cu layer is wet-etched and the barrier layer is dry-etched.