Patent ID: 6132940
Filing Date: 2000-10-17
Classification: G03F

Abstract:
A method of making at least one feature on an object having an upper surface, comprising the steps of:a) applying a layer of a photoresist having an initial thickness to the upper surface;b) exposing the layer of photoresist to a first dosage of light having a first intensity for a first predetermined period of time, such that at least a portion of the upper surface has a first thickness that is at most equal to the initial thickness, the first dose being a local maxima; andc) developing the exposed photoresist;d) exposing the layer of photoresist to a second dosage of light having a second intensity for a second predetermined period of time, such that at least a subset of the portion of the upper surface exposed by the first dosage of light is exposed by the second dosage of light, the first dose less than the second dose, wherein the predetermined second dose of light is required to effectively expose the photoresist at the first thickness and the first dose is sufficient to reduce the initial thickness to the first thickness, the first thickness being capable of being substantially completely developed by the predetermined second dose of light;e) developing the exposed photoresist.