Patent ID: 11973119
Assignee: RENESAS ELECTRONICS CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method of manufacturing a semiconductor device, the method comprising steps of:
(a) forming a first amorphous film, the first amorphous film being a film made of a material containing hafnium and oxygen;
(b) after the step (a), forming a plurality of grains on an upper surface of the first amorphous film so as to cover a part of the upper surface of the first amorphous film and so as to expose another part of the upper surface of the first amorphous film, the plurality of grains containing a first element made of one of aluminum, carbon, nitrogen, fluorine and titanium;
(c) after the step (b), forming a second amorphous film on the upper surface of the first amorphous film so as to cover the plurality of grains and so as to contact with the another part, which is exposed from the plurality of grains, of the upper surface of the first amorphous film, the second amorphous film being a film made of a material containing hafnium and oxygen;
(d) after the step (c), forming a first metal film on the second amorphous film; and
(e) after the step (d), performing heat treatment, thereby crystallizing the first amorphous film to form an orthorhombic first ferroelectric film and crystallizing the second amorphous film to form an orthorhombic second ferroelectric film.