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Solution processed boron doped indium oxide thin-film as channel layer in thin-film transistors

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Abstract

In this work, boron–indium-oxide (BIO) thin-film transistors (TFT) have been fabricated by a solution based processing method. We have studied the structural, morphological, optical and electrical properties of solution processed BIO thin-film for TFT applications. The dopant boron was chosen as an effective carrier suppressor in indium oxide thin-film, owing to high Lewis acid strength, electro-negativity, small ionic size and high boron-oxygen bonding strength. The boron concentration in the indium oxide precursor solution was varied from 0 to 50 at.%. X-ray diffraction analysis confirms the transition of polycrystalline indium oxide thin film to amorphous nature from boron concentration of 20 at.% and above. The thin-films had a uniform smooth surface with an average surface roughness between 0.10 and 0.17 nm. Moreover, the thin-films were shown to be highly transparent (> 86%) in the visible region. The synthesized BIO thin-film was patterned and used as the active channel layer for TFT devices that were fabricated. The BIO (25 at.% boron) TFT post-annealed at 350 °C exhibited amorphous nature with a field effect mobility of 0.8 cm2/V s with threshold voltage at 6.8 V and ION/IOFF of about 4.5 × 108.

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Acknowledgements

The authors are thankful to the Department of Science and Technology-Science and Engineering Research Board, Government of India for financial support under the early career research award (File No. ECR/2016/000785).

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Authors and Affiliations

  1. Nanotech Research Innovation and Incubation Centre, PSG Institute of Advanced Studies, Coimbatore, 641004, India

    S. Arulkumar, S. Parthiban & D. Gnanaprakash

  2. Department of Physics, PSG College of Technology, Coimbatore, 641004, India

    S. Arulkumar & S. Parthiban

  3. School of Integrated Technology, Yonsei University, Incheon, 406-840, Republic of Korea

    J. Y. Kwon

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  1. S. Arulkumar
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Correspondence to S. Parthiban.

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Arulkumar, S., Parthiban, S., Gnanaprakash, D. et al. Solution processed boron doped indium oxide thin-film as channel layer in thin-film transistors. J Mater Sci: Mater Electron 30, 18696–18701 (2019). https://doi.org/10.1007/s10854-019-02222-y

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