Method of manufacturing semiconductor device and substrate processing apparatus

1. A method of manufacturing a semiconductor device, comprising:

forming a protective material composed of a polymer having a urea bond by supplying a raw material for polymerization to a surface of a substrate for manufacturing the semiconductor device, the protective material configured to protect a protection target layer provided in the substrate against a treatment to be performed on the substrate;

subsequently performing the treatment on the substrate on which the protective material is formed; and

subsequently removing the protective material by heating the substrate under a low oxygen atmosphere to depolymerize the polymer.

2. The method of claim 1 , wherein the protective material is a sacrificial film formed on the protection target layer.

3. The method of claim 2 , wherein the protection target layer is a metal film constituting a conductive path of the semiconductor device, and the protective material is formed by being laminated on the metal film.

4. The method of claim 1 , wherein the protection target layer is a porous body, and the protective material is formed by being embedded in the porous body.

5. The method of claim 1 , wherein the low oxygen atmosphere is an atmosphere having an oxygen concentration of 200 ppm or less.

6. The method of claim 1 , wherein the removing the protective material further includes heating the substrate to a temperature lower than 400 degrees C. for five minutes or less.