Patent ID: 6051501
Filing Date: 2000-04-18
Classification: H01L

Abstract:
A method used during the formation of a semiconductor device including a semiconductor wafer assembly, the wafer assembly having a front, a back, a first layer over said front, a second layer overlying said first layer, and a third layer over the back, the method comprising the following steps:forming a first mask having an opening therein over the front of the wafer assembly such that a portion of said second layer is beneath said opening in said mask;etching said portion of said second layer which is beneath said opening to form at least first and second sidewalls in said second layer separated by a horizontal surface;forming a continuous film over said sidewalls and over said horizontal surface; andperforming an etch using said continuous film to protect said sidewalls and said horizontal surface, wherein said continuous film prevents etching of said sidewalls and said horizontal surface during said step of performing said etch.