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Effect of sputtering time on physical and electrical properties of ZrOx thin film on Si

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Abstract:

Purpose ‐ The purpose of this paper is to report the effect of sputtering time on the electrical and physical properties of ZrOx. ZrOx (measured thickness is ranging from 20.5 to 51.3?nm) thin films as gate oxide materials are formed by metal deposition at different sputtering time and thermal oxidation techniques. Design/methodology/approach ‐ Zirconium is deposited on silicon substrate at three different sputtering time; 30-, 60- and 120-s continued with an oxidation process conducted at 500°C for 15?min to form ZrOx thin films. High-resolution X-ray diffraction (HR-XRD), Fourier transform infrared (FTIR) spectroscopy and electrical characterizations were used to examine the properties of the thin film. Findings ‐ A broad ZrOx peak lies in between 26° and 31° from HR-XRD is presumed as the effect of small thickness of ZrOx and or the ZrOx is still partially crystalline. FTIR spectroscopy results suggested that besides ZrOx, SiOx interfacial layer (IL) has also formed in all of the investigated samples. As the sputtering time increases, hysteresis between the forward and reverse bias of capacitance-voltage curve has reduced. The lowest leakage current density and the highest oxide breakdown voltage have been demonstrated by 60-s sputtered sample. These may be attributed to a lower effective oxide charge and interface trap density. The extracted dielectric constant (?) of these oxides is ranging from 9.4 to 18, in which the ? value increases with the increase in sputtering time. Originality/value ‐ ZrOx thin film which was fabricated by sputtering method at different sputtering time and thermal oxidation techniques showed distinctive electrical results. SiOx IL formed in the samples.

Keywords: Silicon; Sputtering deposition; Thermal oxidation; Zirconium; Zirconium dioxide

Document Type: Research Article

DOI: http://dx.doi.org/10.1108/13565361111162567

Publication date: August 2, 2011

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