Method of improving mechanical properties of semiconductor interconnects with nanoparticles

In a BEOL process, UV radiation is used in a curing process of ultra low-k (ULK) dielectrics. This radiation penetrates through the ULK material and reaches the cap film underneath it. The interaction between the UV light and the film leads to a change the properties of the cap film. Of particular c...

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Bibliographic Details
Main Authors TIEN-JEN J CHENG, JUNJING BAO, NAFTALI E LUSTIG
Format Patent
LanguageEnglish
Published 24.12.2014
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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Summary:In a BEOL process, UV radiation is used in a curing process of ultra low-k (ULK) dielectrics. This radiation penetrates through the ULK material and reaches the cap film underneath it. The interaction between the UV light and the film leads to a change the properties of the cap film. Of particular concern is the change in the stress state of the cap from compressive to tensile stress. This leads to a weaker dielectric-cap interface and mechanical failure of the ULK film. A layer of nanoparticles is inserted between the cap and the ULK film. The nanoparticles absorb the UV light before it can damage the cap film, thus maintaining the mechanical integrity of the ULK dielectric.
Bibliography:Application Number: GB20130005611