Patent ID: 6566188
Filing Date: 2003-05-20
Classification: H01L

Abstract:
A method of manufacturing a capacitor of a semiconductor device, the method comprising:forming an interlayer insulating film on the substrate, the interlayer insulating film having multiple doping levels, the multiple doping levels being obtained by controlling concentrations of an impurity during the formation of the interlayer insulating film so that a lower portion of the interlayer insulating film has a higher doping concentration than an upper portion of the interlayer insulating film; forming contact holes by removing given regions of the interlayer insulating film using an etching process to generate vertical profiles at lower portions of each contact hole, each contact hole being tapered radially outwardly from its lower portion to its upper portion; and removing additional interlayer insulating film material from each contact hole by a wet cleaning process to create a vertical profile for each contact hole extending from the lower portion through the upper portion of each contact hole.