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Low indium content In–Zn–O system towards transparent conductive films: structure, properties and comparison with AZO and GZO

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Abstract

In this work, low content indium doped zinc oxide (IZO) thin films were deposited on glass substrates by RF magnetron sputtering using IZO ceramic targets with the In2O3 doping content of 2, 6, and 10 wt%, respectively. The influences of In2O3 doping content and substrate temperature on the structure and morphology, electrical and optical properties, and environmental stability of IZO thin films were investigated. It was found that the 6 wt% doped IZO thin film deposited at 150 °C exhibited the best crystal quality and the lowest resistivity of 9.87 × 10−4 Ω cm. The corresponding Hall mobility and carrier densities were 9.20 cm2 V−1 s−1 and 6.90 × 1020 cm−3, respectively. Compared with 2 wt% Al2O3 doped ZnO and 5 wt% Ga2O3 doped ZnO thin films, IZO thin film with the In2O3 doping content of 6 wt% featured the lowest surface roughness of 1.3 nm. It also showed the smallest degradation with the sheet resistance increased only about 4.4% at a temperature of 121 °C, a relative humidity of 97% for 30 h. IZO thin film with 6 wt% In2O3 doping also showed the smallest deterioration with the sheet resistance increased only about 2.8 times after heating at 500 °C for 30 min in air. The results suggested that low indium content doped ZnO thin films might meet practical requirement in environmental stability needed optoelectronic devices.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (61574144, 21377063), the Zhejiang Natural Science Foundation (LY15F040004), the program for the Ningbo Municipal Science and Technology Innovative Research Team (2015B11002), and the International S&T Cooperation Program of China (ISTCP) (2015DFH60240).

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Authors and Affiliations

  1. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, People’s Republic of China

    Xunna Zhao, Jia Li, Ye Yang, Chaoting Zhu, Jinhua Huang, Juanmei Duan, Yuehui Lu, Pinjun Lan & Weijie Song

  2. Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123, People’s Republic of China

    Xunna Zhao

  3. Ningbo Key Laboratory of Silicon and Organic Thin Film Optoelectronic Technologies, Ningbo, 315201, People’s Republic of China

    Weijie Song

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  1. Xunna Zhao
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  2. Jia Li
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  3. Ye Yang
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  4. Chaoting Zhu
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  5. Jinhua Huang
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  8. Pinjun Lan
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  9. Weijie Song
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Correspondence to Ye Yang or Weijie Song.

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Zhao, X., Li, J., Yang, Y. et al. Low indium content In–Zn–O system towards transparent conductive films: structure, properties and comparison with AZO and GZO. J Mater Sci: Mater Electron 28, 13297–13302 (2017). https://doi.org/10.1007/s10854-017-7165-2

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  • DOI: https://doi.org/10.1007/s10854-017-7165-2

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