Patent ID: 8227177

Claim:
A method for forming a semiconductor device comprising: applying a positive resist to a substrate, the positive resist being capable of contrast reversal such that the positive resist is configured to be insoluble in a developer when irradiated with at least a first dose, the positive resist is configured to be soluble in the developer when irradiated with a second dose, the positive resist is configured to be insoluble in the developer without being irradiated, and wherein the second dose is smaller than the first dose; in one irradiation step, irradiating the positive resist with a mask in accordance with the second dose; before developing the positive resist, in a different irradiation step, irradiating the positive resist with a pattern generator in accordance with the first dose; and developing the positive resist after irradiating with the mask and the pattern generator, wherein, during the developing, first regions of the positive resist exposed with the first dose are not removed and at the same time second regions of the positive resist exposed only with the second dose are removed.