NIST logo

Publication Citation: High-resolution EDS Analysis of Ultra-Thin TaSiN Diffusion Barriers for Cu Metallization using Microcalorimetry

NIST Authors in Bold

Author(s): Robert E. Geer; D. Wu; David A. Wollman;
Title: High-resolution EDS Analysis of Ultra-Thin TaSiN Diffusion Barriers for Cu Metallization using Microcalorimetry
Published: December 31, 2001
Abstract: The advent of microcalorimetry for x-ray detectors holds the promise for high-resolution compositional microanalysis applicable to nanometer-scale devices and structures. To demonstrate this capability, microcalorimeter-based energy dispersive x-ray spectroscopy (EDS) analysis has been used to analyze ultra-thin TaSiN films under development as ion diffusion barriers in sub-0 micro integrated circuit (IC) interconnect devices. We present compositional analyses of TaSiN films carried out using microcalorimetry-based EDS for comparison with similar data acquired using conventional Si(Li) EDS detectors. The elimination of elemental peak overlaps provided by the improved energy resolution of the microcalorimeter x-ray detector is demonstrated for TaSiN EDS spectra from films as thin as 3.5 nm. In addition, by varying the electron probe beam energy, we demonstrate the ability to control the x-ray generation volume within the investigated films. This greatly enhances the suitability of microcalorimetry-based EDS as a characterization/metrology technique for ultra-thin films used for microelectronic by enabling the use of lower electron beam energies leading to smaller x-ray generation volumes.
Proceedings: Proc., IEEE 2001 International (Interconnect Tech. Conf.)
Pages: pp. 192 - 194
Location: Burlingame, CA
Dates: June 3-6, 2001
Keywords: ;energy-dispersive spectrometry (EDS);film thickness microcalorimeter;TaSiN barrier layer;thin film metrology;
Research Areas: Sensors