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Effect of growth and electrical properties of TiOx films on microbolometer design

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Abstract

This paper presents the feasibility of non-stoichiometric TiOx thin films as an active material for bolometer application. The TiOx films have been deposited on glass substrate by DC sputtering with oxygen flow rate of 0.1–0.7 sccm at room temperature and their electrical properties have been studied. The TiOx films were found to be amorphous with dense and smooth surface morphology. The thickness of the films was found to decrease from 150 to 30 nm with an increase in oxygen flow rate. The TiOx film corresponding to 0.7 sccm showed maximum temperature coefficient of resistivity of 0.72%/°C. Performance of TiOx-based bolometer pixel (pitch: 56 μm) is simulated using the electrical characteristics of the deposited films. The TiOx film corresponding to the 0.7 sccm O2 flow rate displayed thermal conductance of 2.95 × 10–7 W/K along with a maximum Figure of Merit of 2.45 × 106 and a time constant of 8.2 ms. The Noise equivalent temperature difference of the bolometer structure is estimated (~ 107 mK).

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Acknowledgements

The authors would like to thank Dr. Seema Vinayak, Director, Solid State Physics Laboratory (DRDO) for her constant encouragement and permission to publish this work. Help from colleagues of SSPL and Delhi University are also acknowledged.

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Authors and Affiliations

  1. Solid State Physics Laboratory, DRDO, Lucknow Road, Timarpur, Delhi, 110054, India

    Isha Yadav, S. S. Lamba, Sudha Gupta, K. K. Jain & Shankar Dutta

  2. Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India

    Isha Yadav & Ratnamala Chatterjee

  3. Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India

    Surbhi Jain, Monika Tomar & Vinay Gupta

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  1. Isha Yadav
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Yadav, I., Jain, S., Lamba, S.S. et al. Effect of growth and electrical properties of TiOx films on microbolometer design. J Mater Sci: Mater Electron 31, 6671–6678 (2020). https://doi.org/10.1007/s10854-020-03223-y

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