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Adhesion strength and nanomechanical characterization of ZnO thin films

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Abstract

The present study was focused to investigate mechanical properties of ZnO thin films deposited on fused quartz substrates at different sputtering deposition pressures (5, 10, 15, and 20 mTorr) using DC sputtering. The crystallinity and microstructure show a marked influence on the mechanical properties of ZnO thin films. The structural evolution of the thin films is in (002) plane and influenced by deposition pressure. The intensity of (002) peak of the films rises initially and decreases with further increasing deposition pressure. The mechanical properties such as hardness, Young’s modulus, and coefficient of friction of ZnO thin films were measured using three-sided pyramidal Berkovich nanoindentation. The adhesion strength of thin films was measured by using scratch test under ramp loading. Load–displacement profile of thin films at continuous indentation cycle without any discontinuity revealed no fracture, cracking event, and defects, which is a consequence of dense microstructure and good adherence of films to the substrate.

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ACKNOWLEDGMENTS

The authors would like to thank Prof. Ramesh Chandra for providing sputtering facility at Institute Instrumentation Center, IIT Roorkee, India.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Vipul Bhardwaj & Rengaswamy Jayaganthan

  2. Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Rajib Chowdhury

  3. Department of Engineering Design, Indian Institute of Technology Madras, Chennai, 600036, India

    Rengaswamy Jayaganthan

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  1. Vipul Bhardwaj
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Correspondence to Rengaswamy Jayaganthan.

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Bhardwaj, V., Chowdhury, R. & Jayaganthan, R. Adhesion strength and nanomechanical characterization of ZnO thin films. Journal of Materials Research 32, 1432–1443 (2017). https://doi.org/10.1557/jmr.2017.85

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