Patent ID: 6100570
Filing Date: 2000-08-08
Classification: H01L,Y02E,Y02P,Y10S

Abstract:
A semiconductor integrated circuit device comprising: a supporting substrate; an insulating film formed on the supporting substrate; a monocrystalline silicon thin film disposed on the insulating film and comprising a monocrystalline silicon wafer having less than 1.times.10.sup.17 atoms/cm.sup.3 in oxygen concentration, the wafer being bonded to the insulating film and thinned to less than 200 .mu.m in thickness; and a photodetector formed in the monocrystalline silicon thin film; wherein the insulating film has a smaller impurity diffusion coefficient than the supporting substrate and a sufficient thickness to prevent oxygen educed from the supporting substrate from diffusing into the monocrystalline silicon thin film, the monocrystalline silicon wafer comprises one of a floating zone substrate and an epitaxial substrate and has a P.sup.+ impurity layer formed proximate an interface with the insulating film, and an interface between the insulating film and at least one of the supporting substrate and the monocrystalline silicon thin film serves as a reflective surface to reflect back light that has passed through a detecting region of the photodetector to increase the sensitivity of the photodetector.