Patent ID: 6686259
Filing Date: 2004-02-03
Classification: H01L

Abstract:
A method for manufacturing a solid state image pick-up device, the method comprising:providing a semiconductor substrate having a front side on which a solid state image pick-up device may be formed, and a rear side opposite to the front side; forming a polysilicon layer including impurities for gettering having a predetermined concentration on the rear side of the semiconductor substrate by introducing the impurities for gettering to a level of the solid solubility in silicon into the polysilicon layer; and reducing the thickness of the polysilicon layer including the impurities for gettering, thereby condensing the impurities for gettering into the reduced polysilicon layer, such that the resulting reduced polysilicon layer has an impurity concentration greater than the solid solubility in silicon and such that the resulting reduced polysilicon layer has a thickness less than its deposition thickness.