| 摘要 |
PCT No. PCT/JP92/01586 Sec. 371 Date Feb. 1, 1993 Sec. 102(e) Date Feb. 1, 1993 PCT Filed Dec. 4, 1992.In a process of manufacturing a semiconductor substrate having a SOI (silicon on insulator) structure, grooves are formed in a silicon layer reduced in thickness to several microns so that the silicon layer is separated into island-like regions corresponding to a chip size or device regions, and a stopper having a thickness corresponding to a desired final thickness of the silicon layer is formed in the grooves. The silicon layer is scanned with a piece of polishing cloth which has an area larger than that of each island-like region but sufficiently smaller than that of silicon layer and which is attached to a pressing surface of the polishing jig, thereby polishing the silicon layer until the stopper is exposed. The thickness of the silicon layer is measured at a position such that the thickness of a portion thereof is measured immediately before the same portion is polished. The pressure applied to the polishing cloth or the rotational speed of the polishing jig is controlled on the basis of thickness data thereby obtained. The thickness of a silicon layer having a diameter of 6 inches was thereby reduced uniformly to 0.1 to 1 mu m.
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