Patent ID: 6214526
Filing Date: 2001-04-10
Classification: G03F,H01L

Abstract:
A method of patterning an underlying layer formed over a substrate comprising:placing a substrate over which the underlying layer has been formed in a plasma-enhanced chemical vapor deposition unit having a reaction chamber;introducing gaseous ammonia and silane into the reaction chamber at a temperature of from 100.degree. C. to 450.degree. C. and at a volumetric ratio of from 1:1 to 7:1 (NH.sub.3 :SiH.sub.4) and in the presence of RF power in the range of 0.02 W/cm.sup.2 to 1 W/cm.sup.2 so as to form a silicon nitride antireflective layer on the underlying layer;forming a photoresist layer on the antireflective layer;exposing the photoresist layer to radiation;developing the photoresist layer;etching the photoresist layer to form at least one aperture in the photoresist layer, thereby exposing a portion of the antireflective layer;etching the exposed portion of the antireflective layer;etching a portion of the underlying layer through the at least one aperture in the photoresist layer;removing the remainder of the photoresist layer; andremoving the remainder of the antireflective layer.