Patent ID: 6544855
Filing Date: 2003-04-08
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising:providing a semiconductor substrate, the substrate having a top surface; forming a plurality of trenches in the substrate, the trenches having sidewalls; forming at least a first insulating layer over the substrate along the trench sidewalls; forming a semiconductor material layer over the first insulating layer along the trench sidewalls; recessing the semiconductor material layer to a predetermined height below the substrate top surface; forming a semiconductor material plug at the top surface of the recessed semiconductor material layer, leaving a void in the bottom of each trench beneath the semiconductor material plug; depositing a second insulating layer over the first insulating layer and over the semiconductor material layer and plug within the trenches; removing the second insulating layer from the top surface of the substrate and the top surface of the semiconductor material plug, leaving portions of the second insulating layer at the top of the trenches; removing the semiconductor material plug; and removing the semiconductor material layer from within the trenches.