Patent ID: 6787274
Filing Date: 2004-09-07
Classification: G03F

Abstract:
A transmittance adjustment mask for optically transcribing a pattern corresponding to integrated circuits onto a semiconductor substrate by using an exposure device, the transmittance adjustment mask comprising:a plurality of features corresponding to circuit elements that form the integrated circuits, the plurality of features having predetermined minimum dimensions and having an isolated edge and a plurality of dense edges; and at least one uniformly semi-transparent dummy feature, which is spaced parallel and apart from the isolated edge of the plurality of features by a predetermined distance such that a first light intensity in a first area of the semiconductor substrate, corresponding to the plurality of dense edges of the plurality of features, is about the same as a second light intensity in a second area of the semiconductor substrate, corresponding to the isolated edge of the plurality of features, wherein the at least one semi-transparent dummy feature has the predetermined minimum dimensions.