Patent ID: 7811727

Claim:
A method for determining an exposure dose for writing a pattern using a beam writer, in which the pattern is written dot-by-dot by exposing the corresponding dot to the beam having a predetermined energy, which comprises: determining an exposure region and a non-exposure region, defining an exposure boundary between the exposure region and the non-exposure region, and defining a marginal region of the exposure region adjacent the exposure boundary; determining a target dose in the whole exposure region that obtains a predetermined energy deposition in a specific position of the exposure region, the predetermined energy deposition being larger than a reference energy deposition in the non-exposure region; locally increasing the target dose in the marginal region to a value that obtains an energy deposition in the marginal region higher than the predetermined energy deposition; and locally decreasing the target dose in an intermediate region of the exposure region, the intermediate region being adjacent to the marginal region, to a value that obtains an energy deposition in the intermediate region smaller than the predetermined energy deposition.