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Band offset determination of p-NiO/n-TiO2 heterojunctions for applications in high-performance UV photodetectors

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Abstract

Nickel oxide (NiO)-decorated titanium dioxide (TiO2) heterojunction photodetectors were prepared by two-step anodization. Surface scattering of NiO particles was successfully controlled by varying second-step anodizing voltage, with substantially less clustering of NiO particles on the TiO2 nanotubes (NTs) observed as the voltage increased. Fabricated photodetectors exhibited higher sensitivity to UV light as NiO surface dispersion increased. Electronic bandgap of TiO2 and that of NiO was determined as ~ 3.35 eV and ~ 3.80 eV, respectively. Introduction of NiO particles on well-ordered TiO2 NTs narrowed the bandgap of TiO2, and the difference between work functions of TiO2 and NiO produced sufficient built-in electric field to separate the electron–hole pairs. This led to an enhanced performance of NiO/TiO2 heterojunction photodetectors, which showed high values of responsivity (86 A/W), external quantum efficiency (292%), and detectivity (2.2 × 1010 Jones) under 365 nm UV light illumination. The valence and conduction band offsets at the interface of the NiO/TiO2 heterojunction were determined as ~ 1.54 eV and ~ 1.99 eV, respectively.

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Acknowledgements

We would like to thank the National Research Council of Thailand (NRCT) for financial support, Ubon Ratchathani University and BL3.2Ua:PES of Synchrotron Light Research Institute, Thailand for providing research equipment.

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  1. Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190, Thailand

    S. Pansri & S. Noothongkaew

  2. Synchrotron Light Research Institute, Nakhon Ratchasima, 30000, Thailand

    R. Supruangnet, H. Nakajima & S. Rattanasuporn

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  1. S. Pansri
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Pansri, S., Supruangnet, R., Nakajima, H. et al. Band offset determination of p-NiO/n-TiO2 heterojunctions for applications in high-performance UV photodetectors. J Mater Sci 55, 4332–4344 (2020). https://doi.org/10.1007/s10853-019-04305-x

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