Patent ID: 6858515
Filing Date: 2005-02-22
Classification: H01L

Abstract:
1. A process for producing a semiconductor device, which comprises: (a) a step of forming a pad oxide film on the circuit-forming side of a semiconductor substrate, (b) a step of forming an oxidation prevention film on the pad oxide film, (c) a step of removing the oxidation prevention film and the pad oxide film at a desired position, thereby exposing the surface of the semiconductor substrate, (d) a step of horizontally recessing the pad oxide film, (e) a step of etching the exposed surface of the semiconductor substrate by isotropic etching, (f) a step of forming a trench to a desired depth, using the oxidation prevention film as a mask, (g) a step of horizontally recessing the pad oxide film, (h) a step of oxidizing the trench formed in the semiconductor substrate, (i) a step of embedding an embedding isolation film in the oxidized trench, (j) a step of removing the embedding isolation film formed on the oxidation prevention film, (k) a step of removing the oxidation prevention film formed on the circuit-forming side of the semiconductor substrate, and (l) a step of removing the pad oxide film formed on the circuit-forming side of the semiconductor substrate.