6:00 PM - 6:15 PM
▲ [18p-Z18-17] Surface Differential Reflectance Spectroscopy in Reactive Magnetron Sputtering
Keywords:plasma diagnostics, plasma-surface diagnostics, reactive magnetron sputtering
Low temperature plasma involved in plasma-based deposition processes, such as reactive magnetron sputtering, are difficult to characterize in terms of its local plasma parameters. An in-situ, noninvasive diagnostic technique can clarify the mechanism of film growth and erosion in reactive plasma, particularly when strong adsorption behavior in the gas is present. One possible method to diagnose plasma immersed surface conditions would be surface differential reflectance spectroscopy (SDRS). The change in the intensity of the reflected light, can determine the change on the surface with respect to an initial state. Time-resolved changes to the surface, of up to 10-20 nm depth can be identified [1]. A DC magnetron sputtering system will be designed to accommodate laser incident at 65o, at both the Zn target and substrate. A USB spectrophotometer will be utilized to record the changes in the observed signal.
Reactive DC magnetron sputtering will be carried out in varying argon to water vapor (Ar-H2O) ratios, with metallic Zn as the sputtering target. Initial optical emission spectra, were obtained for the Ar-H2O plasma, to determine the ideal laser wavelength at which SDRS can be performed. This was collected using a 70-mm target diameter reactive DC magnetron sputtering system, perpendicular to a Zn metal target, at 1.0 Pa and 100 mA discharge current. Changes in the measured peak intensity, due to fluctuations in the plasma, can affect the reliability of the SDRS results. Thus, the presence of Hα and Ar peaks limits the laser wavelength to the <600 nm region. The SDRS experiments will then be performed using continuous wave (CW) lasers of 405 nm and 532 nm.
References
[1] A. Navarro-Quezada, M. Aiglinger, E. Ghanbari, Th. Wagner, and P. Zeppenfeld. Rev. Sci. Instrum. 86. 113108 (2015)
Reactive DC magnetron sputtering will be carried out in varying argon to water vapor (Ar-H2O) ratios, with metallic Zn as the sputtering target. Initial optical emission spectra, were obtained for the Ar-H2O plasma, to determine the ideal laser wavelength at which SDRS can be performed. This was collected using a 70-mm target diameter reactive DC magnetron sputtering system, perpendicular to a Zn metal target, at 1.0 Pa and 100 mA discharge current. Changes in the measured peak intensity, due to fluctuations in the plasma, can affect the reliability of the SDRS results. Thus, the presence of Hα and Ar peaks limits the laser wavelength to the <600 nm region. The SDRS experiments will then be performed using continuous wave (CW) lasers of 405 nm and 532 nm.
References
[1] A. Navarro-Quezada, M. Aiglinger, E. Ghanbari, Th. Wagner, and P. Zeppenfeld. Rev. Sci. Instrum. 86. 113108 (2015)