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Effect of oxygen partial pressure on the behavior of Ga-doped ZnO/p-Si heterojunction diodes fabricated by reactive sputtering

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Abstract

A systematic investigation of Ga-doped ZnO (GZO) films deposited by radio frequency reactive magnetron co-sputtering of Zn and GaAs has been carried out toward the realization of n-GZO/p-Si heterojunction diodes. X-ray diffraction and X-ray photoelectron spectroscopy studies of these films have shown a strong dependence of the c-axis orientation of crystallites, Ga/Zn ratio, oxygen vacancies and chemisorbed oxygen species on the partial pressure (percentage) of oxygen in the Ar-O2 sputtering atmosphere. The GZO films deposited at low O2 percentage (≤ 6%) exhibit Ga/Zn ratio ~ 0.03 and consequently high conductivity ~ 103 Ω−1 cm−1 with carrier concentration > 1020 cm−3, leading to the formation of non-rectifying contact with p-Si. A significant finding of the present study is that the doping level and conductivity of GZO layer can be controlled by O2 percentage in sputtering atmosphere, which has been utilized to fabricate heterojunction diodes with GZO films deposited above 6% O2, which possess low Ga/Zn ratio ~ 0.01 and carrier concentration ≤1019 cm−3. In particular, the diode fabricated with 8% O2 displays ideality factor ~ 7 and reverse saturation current ~ 2 × 10–6 A, along with improved turn-on-voltage and series resistance. The nearly complete c-axis orientation, absence of oxygen vacancies and presence of chemisorbed oxygen at the grain boundaries in GZO layer appear to facilitate improved diode performance.

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Acknowledgements

The authors would like to acknowledge Hall Measurement Central Facility, Central Surface Analytical Facility and HRXRD Central Facility of IIT Bombay for Hall, XPS and XRD measurements, respectively. M. Monish is thanked for the help in electrical and optical measurements.

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  1. Department of Physics, Indian Institute of Technology Bombay, Mumbai, 400076, India

    Praloy Mondal, Shravan K. Appani & S. S. Major

  2. Central Surface Analytical Facility, Indian Institute of Technology Bombay, Mumbai, 400076, India

    D. S. Sutar

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Mondal, P., Appani, S.K., Sutar, D.S. et al. Effect of oxygen partial pressure on the behavior of Ga-doped ZnO/p-Si heterojunction diodes fabricated by reactive sputtering. J Mater Sci: Mater Electron 32, 4248–4257 (2021). https://doi.org/10.1007/s10854-020-05169-7

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