Journal of the Electrochemical Society, Vol.141, No.5, 1375-1377, 1994
An Absorbing Layer Approach to Reducing Reflections in Multilayer Metal Lithographic Processes
We demonstrate that the use of an absorbing layer on top of an interlevel oxide can be used in lieu of the normal antireflective layer approaches to isolate the lithography of a via or contact window level from the reflections of an underlying metal layer. Specifically, we show the use of a sputtered amorphous silicon layer of 500 angstrom thickness in a double level metal process using g-line lithography.