Patent ID: 6204135
Filing Date: 2001-03-20
Classification: H01L

Abstract:
A method for fabricating semiconductor structures, the method which comprises:depositing a thin-film system onto a surface of a semiconductor region, the thin-film system including a partial layer formed of an oxide material and directly adjoining the surface of the semiconductor region;etching a window into the thin-film system with an etching method, the window extending to the surface of the semiconductor region;using the window in the thin-film system for a first selective processing of a partial region of the semiconductor region;using an undercutting process for enlarging the window by moving back, in the partial layer, an edge of the window approximately uniformly by an amount corresponding to a mean undercutting depth in a plane of the partial layer; andsubsequently utilizing the window for a second selective processing of a further partial region of the semiconductor region.