Patent ID: 7989155

Claim:
A method of lithographic patterning comprising: applying to a surface to be patterned a photoresist comprising a polymer resin, a photocatalyst generator which generates a catalyst on exposure to actinic radiation, and a quencher, wherein the quencher comprises 11-20% of the photoresist by weight; exposing the photoresist to actinic radiation through a mask pattern; carrying out a post-exposure bake; and then developing the photoresist with a developer to remove a portion of the photoresist which has been rendered soluble in the developer; wherein either the polymer resin is substantially insoluble in the developer prior to exposure to actinic radiation and rendered soluble in the developer by the action of the catalyst, and by the action of the quencher during the bake, or the polymer resin is soluble in the developer prior to exposure to actinic radiation and rendered substantially insoluble in the developer by the action of the catalyst, and by the action of the quencher during the bake.