Patent ID: 6340543
Filing Date: 2002-01-22
Classification: G03F

Abstract:
A method for manufacturing a photomask comprising a quartz glass and a pattern composed of a metal film formed on a surface of said quartz glass, the method comprising the steps of:detecting whether said pattern has an opaque defect continuous with or proximate to said pattern and having a first width in a first direction and a second width in a second direction, said second direction being perpendicular to said first direction and corresponding to a direction in which an edge of said pattern is extended; and when said opaque defect is detected in said step of detecting, removing said opaque defect by applying a given beam onto a beam irradiation region obtained by correcting in said first direction an irradiation region on said surface of said quartz glass which contains said opaque defect and has third and fourth widths respectively in said first and second directions on the basis of a quantity of bias offset of repairing, wherein said quantity of bias offset of repairing is set in accordance with an output condition of said given beam, the dimension in said first direction of a region on said surface of said quartz glass where said opaque defect exists, and size of said opaque defect so that, when said pattern is transferred onto a semiconductor substrate to form a resist pattern by using said photomask obtained after said step of applying the given beam, the rate of dimensional variation of said resist pattern with respect to original dimension of said resist pattern to be obtained in the absence of said opaque defect falls within a given range, and when said quantity of bias offset of repairing has a minus sign, said given beam is controlled so that said beam irradiation region is given as a region including said irradiation region and a pattern repaired region extending into said pattern in said first direction by the absolute value of said quantity of bias offset of repairing, from a boundary between said opaque defect and said pattern when said opaque defect is continuous with said pattern, and from a part facing to said opaque defect in said edge of said pattern when said opaque defect is proximate to said pattern.