Highly Efficient Visible-Blind Ultraviolet Photodetector Based on Scalably Produced Titanium Dioxide Nanowire Arrays.
basic_science · Level V
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- Record sourced from PubMed, PMID 37349679.
- Also identified by DOI 10.1021/acs.nanolett.3c01383.
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Abstract
Here, we report a novel, feasible, and cost-effective method for the preparation of one-dimensional TiO<sub>2</sub> nanowire arrays using a super-aligned carbon nanotube film as a template. Pure-anatase-phase TiO<sub>2</sub> nanowires were scalably prepared in a suspended manner, and a high-performance ultraviolet (UV) photodetector was realized on a flexible substrate. The large surface area and one-dimensional nanostructure of the TiO<sub>2</sub> nanowire array led to a high detectivity (1.35 × 10<sup>16</sup> Jones) and an ultrahigh photo gain (2.6 × 10<sup>4</sup>), respectively. A high photoresponsivity of 7.7 × 10<sup>3</sup> A/W was achieved under 7 μW/cm<sup>2</sup> UV (λ = 365 nm) illumination at a 10 V bias voltage, which is much higher than those of commercial UV photodetectors. Additionally, by taking advantage of its anisotropic geometry, we found the TiO<sub>2</sub> nanowire array showed polarized photodetection. The concept of using nanomaterial systems shows the potential for realization of nanostructured photodetectors for practical applications.