Patent ID: 7902042
Filing Date: 2011-03-08
Classification: H01L

Abstract:
1. A method of manufacturing an SOI wafer configured as having a base wafer composed of silicon single crystal, and an SOI layer composed of a semiconductor single crystal, bonded on a first main surface of the base wafer while placing a silicon oxide film in between, the SOI wafer destined for an annealing step by infrared irradiation with a peak wavelength λ of 0.7 μm≦λ≦2μm on a top surface of the SOI layer, the method comprising: a delamination-use ion implanted layer forming step of forming a delamination-use ion implanted layer by implanting ions through an ion implantation surface on a first main surface side of a bond wafer, a bonding step of bonding the first main surface of the base wafer composed of a silicon single crystal and the first main surface of the bond wafer composed of a semiconductor single crystal, while placing the silicon oxide film, which is formed on at least one of these main surfaces, in between the first main surface of the base wafer and the first main surface of the bond wafer; a delamination step, following the bonding step, of delaminating a semiconductor single crystal thin layer, destined for the SOI layer, from the bond wafer at the delamination-use ion implanted layer, a nuclei killer annealing step for clearing precipitation nuclei of an oxygen precipitate or reducing a density of formation of the precipitation nuclei in the entire base wafer; and after the nuclei killer annealing step, a bonding annealing step in a batch-type annealing furnace of enhancing bonding of the SOI layer to the base wafer while leaving the silicon oxide film in between the SOI layer and the base wafer, wherein, a refractive index of SiO density of formation of oxygen precipitate in the entire base wafer after the bonding annealing is adjusted to less than 1×10 the nuclei killer annealing is carried out while setting an annealing hold temperature, t, at 900° C.≦t≦1,200° C., with a temperature elevation, t