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Metal Adhesion to <100> Si Substrates with Varying Surface Conditions

  • Nicholas Barbosa (a1), Rodney S. Ridley (a2), Christopher H. Strate (a2), Robert S. Dwyer (a2), Thomas Grebs (a2) and Richard P. Vinci (a1)...

Abstract

Adhesion in multi-layer thin film structures was measured using the four-point bend technique. The investigation primarily focused on layers found in the backside metalization processes of Power MOSFETs (typically in a DMOSFET or U-MOSFET structure). Variation in metal layer and substrate condition produced changes in the adhesion behavior of the systems of interest. Pt, Cu, and Ti metals were applied to Si and SiO2 surfaces with various roughnesses in order to establish the relative contributions of surface chemistry and roughness variation. G values ranging from 2 – 100 J/m2 were measured and it was found that variation in surface chemistry has a larger impact than roughness on the adhesion strength of the systems investigated. The four-point bend adhesion test was determined to be adequate for the measurement of weak to intermediate adhesion of metals on Si wafers with RMS roughness values on the order of the metal film thickness.

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Metal Adhesion to <100> Si Substrates with Varying Surface Conditions

  • Nicholas Barbosa (a1), Rodney S. Ridley (a2), Christopher H. Strate (a2), Robert S. Dwyer (a2), Thomas Grebs (a2) and Richard P. Vinci (a1)...

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