摘要:
The invention provides a method for etching silicon nitride selective to titanium silicide and fabricating multi-level contact openings on a quartermicron device using a two step etch process. The process begins by providing a substrate having thereover a silicon nitride hard mask at one level and a titanium silicide layer at another level wherein the silicon nitride hard mask and the titanium silicide region have an oxide layer thereover. In a first etch step, the oxide layer is patterned to form a first contact opening and a second contact opening. The first contact opening stops on the silicon nitride hard mask and the second contact opening stops on the titanium silicide region. In a second etch step the silicon nitride hard mask is etched through in the first contact opening using an etch selective to titanium silicide. The etch comprises CH2F2 and O2 at a ratio of CH2F2 to O2 of between about 2 and 4.
摘要翻译:本发明提供了一种用于蚀刻对硅化钛有选择性的氮化硅并且使用两步蚀刻工艺在四分之一器件上制造多层接触开口的方法。 该工艺首先提供一层具有氮化硅硬掩模和另一层的硅化钛层的衬底,其中氮化硅硬掩模和硅化钛区域之间具有氧化物层。 在第一蚀刻步骤中,图案化氧化物层以形成第一接触开口和第二接触开口。 第一接触开口在氮化硅硬掩模上停止,并且第二接触开口在硅化钛区域上停止。 在第二蚀刻步骤中,使用对硅化钛的选择性蚀刻,在第一接触开口中蚀刻氮化硅硬掩模。 蚀刻包括CH 2 F 2和O 2,CH 2 F 2与O 2的比例在约2和4之间。
摘要:
A plasma etch method for plasma etch processing a microelectronic layer formed over a substrate, comprises a two step plasma etch method. Within a first step, the microelectronic layer is etched while employing a first plasma etch method employing a first detection apparatus optimized to measure a thickness of the microelectronic layer. The first detection apparatus controls the first plasma etch method to stop prior to reaching the substrate to thus form from the microelectronic layer a partially etched microelectronic layer. Within a second step, the partially etched microelectronic layer is etched while employing a second plasma etch method employing a second detection apparatus optimized to detect the substrate. The second detection apparatus controls the second etch method to stop on the substrate when etching the partially etched microelectronic layer to form a completely etched microelectronic layer. The method is particularly useful for forming gate electrodes for use within field effect transistors for use within semiconductor integrated circuit microelectronic fabrications.