Method for forming via hole and trench for dual damascene interconnection
View Patent ↗A method for forming a via hole and a trench for a dual damascene interconnection comprises forming a via hole through an inter-metal insulating film to expose a portion of a surface of an etch stop film on a lower metal film, forming a photoresist film on an entire surface of the resultant structure and in the via hole, exposing a top surface and a side surface of the inter-metal insulating film by recessing the photoresist film using a development process for the photoresist film, forming a bottom antireflective coating film on the exposed surfaces of the inter-metal insulating film and the photoresist film, forming a mask pattern on the bottom antireflective coating film, forming a trench by an etching process using the mask pattern as an etch mask, and completely removing the photoresist film within the via hole.
1. A method for forming a via hole and a trench for a dual damascene interconnection, comprising:
forming a via hole through an inter-metal insulating film to expose a portion of a surface of an etch stop film on a lower metal film;
forming a photoresist film on an entire surface of the resultant structure and in the via hole;
exposing a top surface and a side surface of the inter-metal insulating film by recessing the photoresist film using a development process for the photoresist film;
forming a bottom antireflective coating film on the exposed surfaces of the inter-metal insulating film and the photoresist film;
forming a mask pattern on the bottom antireflective coating film;
forming a trench by an etching process using the mask pattern as an etch mask; and
simultaneously removing the photoresist film in the via hole and the mask pattern on the bottom antireflective coating film.
2. The method of claim 1 , wherein the photoresist film is formed with an ArF, a KrF, or an I-line light source.
3. The method of claim 2 , wherein forming the photoresist film includes forming the photoresist film to have a dissolution rate of 0.1 to 10000 Å.
4. The method of claim 3 , wherein forming the photoresist film includes adjusting the dissolution rate of the photoresist film using a protection group of resin.
5. The method of claim 3 , wherein forming the photoresist film includes adjusting the dissolution rate of the photoresist film using an amount of Novolak resin and photo acid compound (PAC).
6. The method of claim 1 , wherein recessing the photoresist film includes performing the development using a basic solution having a concentration of 0.0001 to 100 N.
7. The method of claim 6 , wherein the basic solution contains tetramethyl ammonium hydroxide (TMAH) or KOH.
8. The method of claim 6 , wherein a maximum value of a recess depth of the photoresist film is 90000 Å.
9. The method of claim 1 , further comprising performing a rinse process using DI water after performing the development process for the photoresist film.
10. A method for forming a via hole and a trench for a dual damascene interconnection, comprising:
forming a via hole through an inter-metal insulating film to expose a portion of a surface of an etch stop film on a lower metal film;
forming a photoresist film on an entire surface of the resultant structure and in the via hole;
performing an exposure process for the photoresist film;
exposing a top surface and a side surface of the inter-metal insulating film by recessing the exposed photoresist film using a development process for the photoresist film;
forming a bottom antireflective coating film on the exposed surfaces of the inter-metal insulating film and the photoresist film;
forming a mask pattern on the bottom antireflective coating film;
forming a trench by an etching process using the mask pattern as an etch mask; and
simultaneously removing the photoresist film within the via hole and the mask pattern on the bottom antireflective coating film.
11. The method of claim 10 , wherein performing the exposure process for the photoresist film includes using a stepper or a scanner having an I-line light source.
12. The method of claim 10 , wherein performing the exposure process for the photoresist film includes exposing an entire surface and does not use a reticle.
13. The method of claim 10 , further including adjusting a recess depth of the photoresist film by controlling an amount of exposure in the exposure process and a development time.