Method of fabricating semiconductor device, vacuum processing apparatus and substrate processing apparatus

1. A method of fabricating a semiconductor device by performing a process on a substrate, comprising:

forming a masking film made of a polymer having a urea bond by supplying polymerizing raw materials to a surface of the substrate on which an etching target film is formed;

forming an etching pattern on the masking film;

subsequently, etching the etching target film with a processing gas using the etching pattern; and

subsequently, removing the entire masking film by heating the substrate to a temperature range from 300 degrees C. to less than 350 degrees C. to depolymerize the polymer,

wherein the step of forming the masking film includes copolymerizing an isocyanate and an amine to form the urea bond, and

wherein the amine is 1,12-diaminododecane (DAD) and the isocyanate is 1,3-bis (isocyanatomethyl) cyclohexane (H 6 XDI).

2. The method of claim 1 , wherein the step of forming the masking film includes heating the substrate so as to polymerize the isocyanate and the amine while supplying an isocyanate vapor and an amine vapor to the etching target film.

3. The method of claim 1 , wherein the step of forming the masking film includes heating the substrate so as to mix the isocyanate and the amine and to subject the mixture to a polymerization reaction on the surface of the substrate, while supplying a liquid isocyanate and a liquid amine to the etching target film.

4. The method of claim 1 , wherein the etching target film is an insulating film.

5. The method of claim 4 , wherein the etching target film is an interlayer insulating film.

6. The method of claim 5 , wherein the interlayer insulating film is an insulating layer containing silicon, carbon and oxygen.