Patent ID: 7807340

Claim:
A method of creating a patterned object using visible light, the method comprising: (a) coating a substrate with a chemical amplification photoresist suitable for use in the visible light wavelength range, (b) exposing the photoresist to visible light, and (c) developing the exposed photoresist, thereby creating a photoresist pattern on the substrate, wherein the photoresist is maintained at or around ambient temperature from the time that it is exposed through the time that it is developed, wherein the chemical amplification photoresist is a lithographic photoresist composition comprising a photosensitizer having the structure of formula (I): wherein: Ar 1 and Ar 2 are independently selected from monocyclic aryl and monocyclic heteroaryl, R 1 and R 2 may be the same or different, and have the structure —X—R 3 where X is O or S and R 3 is C 1 -C 6 hydrocarbyl or heteroatom-containing C 1 -C 6 hydrocarbyl, and R 4 and R 5 are independently selected from the group consisting of hydrogen and —X—R 3 , or, if ortho to each other, may be taken together to form a five- or six-membered aromatic ring, with the proviso that any heteroatom contained within Ar 1 , Ar 2 , or R 3 is O or S.