Patent ID: 7648848

Claim:
A semiconductor integrated circuit production method comprising: an SOI substrate preparation step for preparing a plurality of SOI substrates, each said SOI substrate having an SOI layer on a surface thereof, each said SOI layer having a thickness; a layer thickness adjustment step for adjusting the thicknesses of the SOI layers by carrying out a layer thickness adjustment surface treatment on the SOI layers; and a semiconductor integrated circuit formation step for forming semiconductor integrated circuits on the SOI layers following the layer thickness adjustment step, wherein the layer thickness adjustment step includes: an SOI layer thickness database generation step for generating an SOI layer thickness database that correlates identification data for each said SOI substrate with measurement data of the thickness of each said SOI layer, and a surface treatment step for extracting the measurement data for each said SOI substrate from the SOI layer thickness database and carrying out the layer thickness adjustment surface treatment on the SOI substrates according to treatment conditions decided based on the extracted measurement data, wherein the surface treatment step further includes a step of grouping the SOI substrates having mutual similarities in the measurement data, the step of grouping including a step of sorting the SOI substrates by the measurement data with respect to the mutual similarities, and the layer thickness adjustment surface treatment is simultaneously carried out on the SOI substrates belonging to a same group.