Patent ID: 8492075
Filing Date: 2013-07-23
Classification: G03F,H01L

Abstract:
1. A method of forming an electronic device, comprising: (a) providing a semiconductor substrate comprising one or more layers to be patterned; (b) applying a first layer of a first photosensitive composition over the one or more layers to be patterned, wherein the first photosensitive composition comprises a first resin component and a first photoactive component; (c) exposing the first layer to activating radiation through a patterned photomask; (d) developing the exposed first layer to form a first resist pattern; (e) heat treating the first resist pattern in a hardbake process; (f) treating the hardbaked first resist pattern in a spin coating process with a material effective to make alkaline a surface of the first resist pattern; (g) applying a second layer of a second photosensitive composition over the one or more layers to be patterned and in contact with the alkaline surface of the first resist pattern, wherein the second photosensitive composition comprises a second resin component and a photoacid generator and is negative-acting; (h) exposing the second layer to activating radiation by flood-exposure; and (i) developing the exposed second layer to form a second resist pattern, wherein regions of the second layer in the vicinity of the first resist pattern are removed to define openings between the first and second resist patterns.