Patent ID: 8974870
Filing Date: 2015-03-10
Classification: C23C,H01L

Abstract:
1. A method for producing a porogen-residue free ultra low-k film, comprising: (a) depositing a low-k material comprising an organic porogen on a substrate by at least one technique selected from the group consisting of plasma enhanced chemical vapor deposition, chemical vapor deposition, and spin-on deposition; thereafter (b) subjecting the deposited low-k material comprising the organic porogen to atomic hydrogen treatment at a substrate temperature of from 200° C. to 430° C. for a time of from 10 sec. to 800 sec., whereby the organic porogen is removed, wherein the atomic hydrogen treatment is performed in an afterglow of hydrogen-comprising plasma while avoiding a presence of hydrogen-excited radicals and ions, electrons, and UV light; thereafter (c) performing a first UV-assisted thermal curing step with a UV light having a wavelength higher than or equal to 200 nm and at a substrate temperature of from 300° C. to 500° C., whereby the deposited low-k material is cured without depleting Si—CH (d) subjecting the deposited low-k material to at least one of patterning and wet chemical processing; and thereafter (e) performing a second UV-assisted thermal curing step with a UV light having a wavelength lower than 200 nm and at a substrate temperature of from 300° C. to 500° C., whereby cross-linking reactions are promoted, whereby a mechanical resistance of the deposited low-k material is increased, whereby a porogen-residue free ultra low-k film having a k-value of from 1.8 to 2.6, a porosity higher than 40%, and an elastic modulus above 5 GPa is obtained.