Patent ID: 6146980
Filing Date: 2000-11-14
Classification: H01L

Abstract:
A method for manufacturing silicon substrates having gettering capability, which comprises the steps of:(a) providing a silicon substrate having a top surface and a bottom surface;(b) forming a first pad oxide layer over the top surface, and a second pad oxide layer over the bottom surface;(c) forming a silicon nitride layer only above the first paid oxide layer;(d) using the silicon nitride layer as a mask to remove the second pad oxide layer until the bottom surface of the silicon substrate is at least partially exposed; and(e) using the silicon nitride layer as a mask, etching the bottom surface of the silicon substrate for about 1-3 minutes using a solvent composed of potassium hydroxide and deionized water in a molar ratio of 1 to 6 so that the silicon substrate has the gettering capability, wherein the etched bottom surface forms a damaged layer having a thickness of about 75-95 .ANG..