Application of nanoindentation to characterize fracture in ILD films used in the BEOL

Abstract

It is of importance to understand cracking behavior in low dielectric constant, low modulus materials. Nanoindentation method is presented as a tool to estimate the critical film thickness, thickness above which spontaneous cracking could occur, for ILD films used in the BEOL. The critical film thickness was then used to calculate cohesive energies and fracture toughness of the films. Materials were investigated using nanoindentation combined with APM imaging. The results were compared to data acquired by four point bend methods. © 2005 Materials Research Society.