VPD-DC-TXRF for Metallic Contamination Analysis of Ge Wafers

Abstract:

• Periodical: Solid State Phenomena (Volumes 103-104)
• Pages: 213-216
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.103-104.213
• Online since: April 2005
• Authors: David Hellin, V. Geens, I. Teerlinck, Jan Van Steenbergen, Jens Rip, W. Laureyn, G. Raskin, Paul W. Mertens, Stefan De Gendt, Chris Vinckier
• Keywords: Ge, Metallic Contamination Analysis, VPD-DC-TXRF

References

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[5] D. Hellin, J. Rip, S. Arnauts, S. De Gendt, P.W. Mertens and C. Vinckier, 'Validation of VPD-DC-TXRF Spectrometry for Metallic Contamination Analysis of Silicon Wafers', in press for Spectrochim. Acta B

[6] D. Hellin, W. Fyen, J. Rip, T. Delande, P.W. Mertens, S. De Gendt and C. Vinckier, 'TXRF Saturation Effects on Micro-droplet Residues', submitted for publication in J. Analytical Atomic Spectroscopy

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[8] Y. Yamada, S. Kozuka, A. Shimazaka and M. Takenaka, in: Diffusion and Defect Data Part B (Solid State Phenomena) ,M. Heyns, P. Mertens and M. Meuris (Editors) 92 (2003) 97 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.E+12 1.E+14 1.E+16 1.E+18 N Ge (atoms) WL MoK ηTXRF ■ WLβ ◊ MoKα 0 0.2 0.4 0.6 0.8 1 1.2 K Ca Cr Fe Ni Zn η Collection ηVPD-DC-TXRF 0.00 0.20 0.40 0.60 0.80 1.00 HF HCl 1.E+10 1.E+11 1.E+12 1.E+13 1.E+14 1.E+15 HF HCl N Ge (atoms) (a) (b) Figure 1: Contact angle as a function of the HCl concentration in the contact droplet on Ge wafers after HF VPD treatment. Figure 2: Collection efficiency of VPD-DC applied on multi-element spin coated Ge wafers. Figure 3: TXRF accuracy measured on metal traces (K, Sc, Cr, Fe, Ni, Zn all at 2.5E12 atoms) in residues with increasing Ge content for two TXRF excitation energies. 1.E+11 1.E+12 1.E+13 1.E+14 1.E+15 1.E+16 1.E+17 50 60 70 80 90 100 N Ge (atoms) 0.2% HCl 2.2% HCl 20% HCl 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 50 60 70 80 90 100 T Waf er (°C) 2.2%HCl 20%HCl 0% HCl ηTXRF (a) (b) TWafer (ºC) TWafer (ºC) Figure 4 (a): Influence of the HCl concentration and wafer temperature on the removal of Ge (start amount 4E16 atoms) and (b) related TXRF detection efficiency of traces (K, Ca, Cr, Fe, Ni, Zn all at 2.5E12 atoms) Figure 5: (a) Residual Ge content after VPD-DC on Ni spin coated Ge wafers with two VPD treatments and (b) efficiency of the total VPD-DC-TXRF process 0 10 20 30 40 50 60 70 0 10 20 30 40 θθθθContact (deg) CHCl (w%)