Patent ID: 7376512
Filing Date: 2008-05-20
Classification: B82Y,G03F

Abstract:
1. A method for determining an absorber stack geometry of a lithographic reflection mask comprising a reflection layer and an absorber stack provided on the reflection layer, comprising: a) defining a target pattern for a structure imaged on a substrate by an exposure tool including the lithographic reflection mask to reflect a radiation, the target pattern comprising a range of target critical dimension values; b) providing a predefined combination of a plurality of absorber stack parameters, wherein one or more of the absorber stack parameters are constants and one or more of the absorber stack parameters are variables; c) defining a plurality of absorber stack geometries according to the absorber stack geometry definition by providing a plurality of different values for the one or more variables; d) for each absorber stack geometry: whereby a respective process window is determined for each absorber stack geometry; and e) comparing the respective sizes of the respective determined process windows to identify a process window having a maximum process window size, thereby identifying the respective absorber stack geometry corresponding to the identified process window.