Method for forming contact hole for dual damascene interconnection in semiconductor device
View Patent ↗A method for forming a contact hole for a dual damascene interconnection in a semiconductor device. A via hole is formed to expose an etch stop film on a lower metal film through an intermetal insulating film. The via hole is filled with a sacrificial film. A bottom antireflective coating film and a mask pattern are formed on the intermetal insulating film and the sacrificial film. An etching process is performed to form a trench to expose a portion of a surface of the intermetal insulating film and a top surface of the sacrificial film. A post etch treatment is performed to remove the sacrificial film, using the mask pattern as an etching mask. The exposed etch stop film is removed to expose a portion of a surface of the lower metal film. A passivation process is performed for the exposed surface of the lower metal film.
1. A method for forming a contact hole for a dual damascene interconnection in a semiconductor device, comprising the steps of: forming a via hole to expose an etch stop film on a lower metal film through an intermetal insulating film; filling the via hole with a sacrificial film; forming a bottom antireflective coating film and a mask pattern on the intermetal insulating film and the sacrificial film; performing an etching process to form a trench to expose a portion of a surface of the intermetal insulating film and a top surface of the sacrificial film; performing a post etch treatment to remove the sacrificial film, using the mask pattern as an etching mask; removing the exposed etch stop film to expose a portion of a surface of the lower metal film; and performing a passivation process for the exposed surface of the lower metal film.
2. The method according to claim 1 , wherein the sacrificial film comprises a photoresist film.
3. The method according to claim 1 , wherein performing the etching process to form the trench comprises: removing the bottom antireflective coating film with an etching process; and removing the intermetal insulating film with an etching process.
4. The method according to claim 3 , wherein removing the bottom antireflective coating film comprises etching with a plasma etching process using C x F y /O 2 gas.
5. The method according to claim 3 , wherein removing the intermetal insulating film comprises etching with a plasma etching process using C x F y gas.
6. The method according to claim 1 , wherein performing the post etch treatment comprises performing the treatment using O 2 plasma.
7. The method according to claim 1 , wherein removing the etch stop film comprises etching with a plasma etching process using C x F y gas.
8. The method according to claim 1 , wherein performing the passivation process comprises performing the passivation process using N 2 plasma.
9. A method for forming a contact hole for a dual damascene interconnection in a semiconductor device, comprising the steps of: step for forming a via hole to expose an etch stop film on a lower metal film through an intermetal insulating film; step for filling the via hole with a sacrificial film; step for forming a bottom antireflective coating film and a mask pattern on the intermetal insulating film and the sacrificial film; step for performing an etching process to form a trench to expose a portion of a surface of the intermetal insulating film and a top surface of the sacrificial film; step for performing a post etch treatment to remove the sacrificial film, using the mask pattern as an etching mask; step for removing the exposed etch stop film to expose a portion of a surface of the lower metal film; and step for performing a passivation process for the exposed surface of the lower metal film.
10. The method according to claim 9 , wherein the sacrificial film comprises a photoresist film.
11. The method according to claim 9 , wherein the step for performing the etching process to form the trench comprises: step for removing the bottom antireflective coating film with an etching process; and step for removing the intermetal insulating film with an etching process.
12. The method according to claim 11 , wherein the step for removing the bottom antireflective coating film comprises step for etching with a plasma etching process using C x F y /O 2 gas.
13. The method according to claim 11 , wherein the step for removing the intermetal insulating film comprises step for etching with a plasma etching process using C x F y gas.
14. The method according to claim 9 , wherein the step for performing the post etch treatment comprises step for performing the treatment using O 2 plasma.
15. The method according to claim 9 , wherein the step for removing the etch stop film comprises step for etching with a plasma etching process using C x F y gas.
16. The method according to claim 9 , wherein the step for performing the passivation process comprises step for performing the passivation process using N 2 plasma.