Patent ID: 7118833

Claim:
A photomask used to form a partial-depth feature in a polymer film on a semiconductor wafer, and, substantially simultaneously, used to form a full-depth feature in the polymer film on the semiconductor wafer during one series of photo-imaging steps using exposure tools capable of resolving a minimum resolvable size to form a feature completely through the polymer film, the polymer film having a film thickness, the partial-depth feature having a depth substantially less than the film thickness, the full-depth feature having a depth approximately equal to the film thickness, the photomask comprising: a transparent plate; at least one full-depth producing pattern, each full-depth producing pattern including an area of UV light-blocking material disposed on the transparent plate, the area having a larger dimension and a smaller dimension, the smaller dimension being equal to or greater than minimum resolvable size; and a partial-depth producing pattern including a plurality of areas of UV light-blocking material disposed on the transparent plate, each area of the plurality of areas having a larger dimension and a smaller dimension, the smaller dimension being less than the minimum resolvable size, each area being spaced from another area by a distance less than the minimum resolvable size.