Patent ID: 6444524
Filing Date: 2002-09-03
Classification: H01L

Abstract:
A method for manufacturing a deep trench capacitor, comprising:defining a silicon substrate; forming a layer of silicon nitride over the silicon substrate; depositing a layer of borosilicate glass having a predetermined thickness over the layer of silicon nitride; patterning and defining the layer of borosilicate glass to expose two regions of the silicon substrate separated by a sacrificial mask, wherein the sacrificial mask includes the layer of borosilicate glass and the layer of silicon nitride; etching the two regions of the silicon substrate to form two trenches, each having sidewalls, wherein the predetermined thickness of the layer of borosilicate glass allows the sacrificial mask and a portion of the silicon substrate beneath the sacrificial mask to be removed; depositing a layer of silicon nitride on the sidewalls of the trenches to form a dielectric layer; and depositing doped polysilicon into the trenches to form a single capacitor.