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Influence of Process Parameters and Formation of Highly c-Axis Oriented AlN Thin Films on Mo by Reactive Sputtering

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Abstract

It is challenging to grow aluminum nitride (AlN) in c-axis orientation on a metal electrode, primarily due to lattice mismatch and the difference between the coefficients of thermal expansion. In this work, we investigate and optimize the effects of several process parameters such as plasma power, N2 flow concentration, quality of the bottom electrode, and oxygen content. The optimized deposition parameters are necessary for the growth of highly c-axis textured AlN thin film having a thickness of 300 nm on a Mo/SiO2/Si substrate. To this end, c-axis oriented AlN thin films were sputtered on a molybdenum (Mo) electrode at the low substrate temperature (300°C). The quality of the Mo electrode was optimized in terms of the surface roughness, interfacial energy, and full width at half maximum (FWHM) of x-ray diffraction (XRD) peak for facilitating the c-axis growth of the AIN film. Results indicate that the growth of AlN film in (002) orientation on the Mo electrode strongly depends on plasma power, the optimum value of which is found to be 300 W. Also, an extremely low FWHM of AlN (002) peak 0.62° is achieved at ∼ 38% N2 concentration. The oxygen content is also found to be an influential parameter, with a threshold value of 28% by atomic weight, beyond which amorphous growth of the AIN film is observed. The fabricated Mo-AlN-Mo structure has a dielectric constant of 8.89 and a capacitance value of 42 pF measured across the top electrode area of 400 × 400 μm2. The grown c-axis oriented AlN film can be used in applications such as the piezoelectric energy harvester (PEH) and the thin-film bulk acoustic resonator (FBAR).

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Acknowledgment

The authors thank the Institute Instrumentation Centre (IIC), IIT Roorkee, for their support in the characterization of deposited thin films.

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Authors and Affiliations

  1. Microelectronics Laboratory, Department of Electronics and Communication Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Sandeep Singh Chauhan & Sanjeev Kumar Manhas

  2. Department of Mechanical & Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    M. M. Joglekar

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  1. Sandeep Singh Chauhan
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Correspondence to Sandeep Singh Chauhan.

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Chauhan, S.S., Joglekar, M.M. & Manhas, S.K. Influence of Process Parameters and Formation of Highly c-Axis Oriented AlN Thin Films on Mo by Reactive Sputtering. J. Electron. Mater. 47, 7520–7530 (2018). https://doi.org/10.1007/s11664-018-6695-6

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  • DOI: https://doi.org/10.1007/s11664-018-6695-6

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