Patent ID: 7157373

Claim:
A method of fabricating a semiconductor device, the method comprising: providing a workpiece; depositing a porous dielectric material over the workpiece; forming a pattern in the porous dielectric material, the pattern comprising sidewalls; depositing a layer of photosensitive material over the porous dielectric material that covers the sidewalls of the pattern in the porous dielectric material such that said photosensitive material soaks a first distance into the sidewalls of the pattern in the porous dielectric material; providing light having a wavelength selected to develop the photosensitive material; developing and removing portions of the photosensitive material exposed to said light; and leaving portions of said photosensitive material that soaked into said porous sidewalls unexposed, and undeveloped such that said photosensitive material that soaked in said porours sidewalls is not removed, and forms a barrier region of photosensitive material within the sidewalls.