Patent ID: 8524615

Claim:
A method of fabricating a hardened porous dielectric layer, the method comprising: forming a dielectric layer containing porogens on a substrate; transforming the dielectric layer into a porous dielectric layer using a first UV curing process to remove the porogens from the dielectric layer; and transforming the porous dielectric layer into a crosslinked porous dielectric layer using a second UV curing process to generate crosslinks in the porous dielectric layer, wherein the first UV curing process includes irradiating a first UV light including broadband wavelengths in which wavelengths being equal to or less than 280 nm are equal to or less than 15% of a first total intensity of the first UV light, and the second UV curing process includes irradiating a second UV light including broadband wavelengths in which wavelengths being equal to or less than 280 nm are equal to or more than 15% of a second total intensity of the second UV light.