Synthesis of Cerium Dioxide High-k Thin Films as a Gate Dielectric in MOS Capacitor

Authors Anil G. Khairnar, Y.S. Mhaisagar , A.M. Mahajan
Affiliations Department of Electronics, North Maharashtra University Jalgaon, 425001, Maharashtra, India
Issue Volume 5, Year 2013, Number 3
Dates Received 24 December 2012; revised manuscript received 04 July 2013; published online 12 July 2013
Citation Anil G. Khairnar, Y.S. Mhaisagar, A.M. Mahajan, J. Nano- Electron. Phys. 5 No 3, 03002 (2013)
PACS Number(s) 77.55. + f, 81.20.Fw, 68.37, Hk, 85.30.Tv, 84.37. + q.
Keywords High-k (8) , CeO2, Gate dielectric (5) , Sol-gel (15) , XRD (64) , FTIR (22) .
Annotation In the present study, the Al/CeO2 / p-Si MOS capacitor was fabricated by depositing the Aluminium (Al) metal layer by thermal evaporation technique on sol-gel derived CeO2 high-k thin films on p-Si substrate. The deposited CeO2 films were characterized by Ellipsometer to study the refractive index that is determined to be 3.62. The FTIR analysis was carried out to obtain chemical bonding characteristics. Capacitance-voltage measurements of Al/CeO2 /p-Si MOS capacitor were carried out to determine the dielectric constant, equivalent oxide thickness (EOT) and flat band shift (VFB) for the deposited CeO2 film of 16.22, 1.62 nm and 0.7 V respectively. The conductance voltage curve was used to determine the interface trap density (Dit) at the CeO2 / p-Si interface that is calculated to be 1.29 × 1013 cm – 2 eV – 1 for measurement frequency of 500 kHz.

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