Patent ID: 7186488

Claim:
A semiconductor device manufacturing method comprising: a step of forming a film on a semiconductor wafer from which multiple semiconductor chips are produced; a step of coating a photoresist on the film; a step of calculating an exposure time for the photoresist for each semiconductor chip; a step of exposing a device pattern on the photoresist for the calculated exposure time; a step of developing the exposed photoresist and making the photoresist into a resist pattern; and a step of etching the film and making the film into a device pattern while using the resist pattern as an etching mask; wherein the step of calculating the exposure time includes (a) a step of deciding whether or not a variation of a line width of the device pattern or the resist pattern in a reference chip in a plurality of previously manufactured semiconductor wafers, which have the same wafer information as a subject semiconductor wafer, fall within a tolerance, and (b) a step of correcting the exposure time for each chip by using an exposure correction table if it is decided in the step (a) that the variation falls within the tolerance.