Method and device for producing layout patterns of a semiconductor device having an even wafer surface

1. A method of fabricating a semiconductor device in which diffusion layers and trenches for isolating elements are formed on a wafer, following which an insulating film is formed over the entire surface of said wafer including the interior of said trenches, and said insulating film is ground to planarize the surface of said wafer, said method comprising:

forming primitive cells having circuit patterns of constituent elements of said semiconductor device in the element formation area of said semiconductor device; and

forming at least one fill cell with a diffusion layer and no wiring, in a vacant area that is to be generated forming said primitive cells.

2. A method according to claim 1 , wherein said fill cell is formed such that said diffusion layers are uniformly distributed in said element formation area of said semiconductor device.

3. A method according to claim 1 , wherein said fill cell is formed such that the distribution ratio falls within the range 30-55% in said element formation area, said distribution ratio being the proportion of said diffusion layers that are distributed in said element formation area of said semiconductor device.

4. A method according to claim 1 , wherein:

said constituent elements are grouped such that constituent elements having related operations are sorted into the same group; and

said primitive cells associated with constituent elements that belong to the same group are formed in proximity.

5. A method according to claim 1 , further comprising:

forming an insulating film on a surface of a semiconductor substrate after a diffusion layer is formed; and

planarizing the surface of a semiconductor substrate by a CMP (Chemical Mechanical Polishing) process by using the diffusion layer of a primitive cell and a fill cell as a stopper.