Patent ID: 8586290

Claim:
A lithography method, comprising: forming a photosensitive layer on a substrate, the photosensitive layer including: a polymer that turns soluble to a base solution in response to reaction with acid; a plurality of photo-acid generators (PAGs) that decompose to form acid in response to radiation energy; and a plurality of quenchers having boiling points distributed between about 200 C and about 350 C, having molecular weights distributed between about 300 Dalton and about 20000 Dalton, and vertically distributed in the photosensitive layer such that a first concentration C1 within a top 25% portion of the photosensitive layer is greater than a second concentration C2 within a bottom 25% portion of the photosensitive layer; exposing the photosensitive layer; baking the photosensitive layer; and developing the exposed photosensitive layer.