Study of viscoplastic deformation in porous organosilicate thin films for ultra low-k applications

Appl. Phys. Lett. 102, 221909 (2013).

Emil H. Zin, W. H. Bang, E. Todd Ryan, Sean W. King, Choong-Un Kim.

Materials Science and Engineering, University of Texas at Arlington, Arlington, Texas 76019, USA and

GLOBALFOUNDRIES, 257 Fuller Road, Albany, New York 12203, USA and

Logic Technology Development, Intel Corporation, 5200 NE Elam Young Parkway, Oregon 97124, USA.




This letter reports experimental observations evidencing the viscoplasticity of porous organosilicate glass thin films under conditions pertinent to their application in advanced low-k/Cu interconnect technology. Specifically, it is found that porous SiCOH thin films exhibit a significant level of viscoplasticity with a rate sensitive to the porosity, the degree of plasma damage, and hydration reaction when tested using a ball indenter at 150–400 °C. The activation energy of the viscosity (1.25–1.45 eV) is measured to be far lower than the bulk glass (>4 eV), suggesting that the viscous flow is affected by the presence of defective bond-network such as Si–OH or Si–H bonds.

© 2013 AIP Publishing LLC

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