4.6 Article

Three-dimensional hedgehog-like ZnO/SnO2 hierarchical heterostructure for high performance self-powered ultraviolet photodetector

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出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2022.106634

关键词

ZnO nanorods; SnO2 octahedron nano-blocks ; Solution synthesis; Self-powered ultraviolet photodetector

资金

  1. National Key Research and Development Program of China [2019YFA0705201]
  2. Natural Science Foundation of Heilongjiang Province of China [LH2020E033]
  3. Natural Science Foundation of China [12074095]
  4. Funda-mental Research Funds for the Central Universities

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In this study, a novel hedgehog-like ZnO/SnO2 hierarchical heterostructure was successfully prepared and applied in ultraviolet photodetector (UVPD), exhibiting excellent performance with high photoresponsivity and strong photocurrent density.
A novel hedgehog-like ZnO/SnO2 hierarchical heterostructures composing of one-dimensional ZnO nanorods (NRs) and three-dimensional SnO2 octahedron nano-blocks (ONBs) have been successfully prepared on ITO substrate through a simple solution method. The results show that ZnO NRs are uniformly and densely distributed perpendicular to the surface of the SnO2 ONB. The as-prepared ZnO NRs/SnO2 ONB (Z/S) hierar-chical heterostructure is applied to assemble ultraviolet photodetector (UVPD). Under UV light illumination, it can obviously find that the Z/S UVPD can work at zero bias voltage and exhibits a remarkable stability and repeatability. In addition, the Z/S UVPD displays excellent characteristics over that based on SnO2 ONBs, in particular a relatively high photoresponsivity, a strong photocurrent density of 0.94 mA cm(-2), together with a high on/off ratio of 5362. Moreover, the possible mechanisms for growth and UV detection on the hedgehog-like Z/S hierarchical heterostructure have been discussed.

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