Patent ID: 7977016

Claim:
A method for fabricating an extreme ultraviolet (EUV) lithography mask, comprising: forming a reflecting layer, an absorber layer, and a resist layer sequentially over a substrate; defining an exposure region and a non-exposure region of the resist layer; defining a plurality of split regions by partially splitting the exposure region with regular spacing; performing an exposure process on the exposure region by irradiating an electron beam, wherein the intensity of the electron beam is increased from an outermost split region to a central split region, whereby the irradiated electron beam have different reaching depth on the respective split region; forming a resist layer pattern that has a slanted side wall profile by performing a development process to remove the portions of the resist layer, wherein an amount removed by a developing solution is different by the split regions and thus the remaining thickness is different by the split regions; and forming an absorber layer pattern with a slanted side wall profile by sequentially etching the portion of the absorber layer exposed by the resist layer pattern.