Patent ID: 7670858

Claim:
A manufacturing method for a semiconductor device whose main surface contains a sensor region formed from multiple sensor cells, comprising: (a) a process for forming a first insulating film on the semiconductor substrate; (b) a process for forming a sacrificial pattern for forming a cavity on the first insulating film; (c) a process for forming a second insulating film so as to cover the sacrificial pattern on the first insulating film; (d) a process for forming a first conducting layer patterned on the second insulating film; (e) a process for forming a third insulating film so as to cover the first conducting layer on the second insulating film; (f) a process for forming an opening so as to expose a portion of the sacrificial pattern on the second and the third insulating films; (g) a process for forming a cavity between the first insulating film and the second insulating film by selectively etching the sacrificial pattern by way of the opening; and (h) a process for forming a fourth insulating film so as to block the opening on the third insulating film after the (g) process, wherein each of the multiple sensor cells in the sensor region includes: a cavity; and a first electrode formed on the cavity and made from the first conducting layer, wherein in the (b) process among the sacrificial patterns, a first sacrificial pattern is formed on the sensor region, and among the sacrificial patterns, a second sacrificial pattern is formed on a first region other than the sensor region, wherein in the (f) process, a first opening is formed so as to expose a portion of the first sacrificial pattern, and a second opening is formed so as to expose a portion of the second sacrificial pattern, on the second and the third insulating films, and wherein in the (g) process, the etched state of the second sacrificial pattern on the first region is observed, after selectively etching the first and the second sacrificial patterns by way of the first opening and the second opening.