Highly Efficient Visible-Blind Ultraviolet Photodetector Based on Scalably Produced Titanium Dioxide Nanowire Arrays

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Development of high-performance photodetectors is crucial for various applications.
• Titanium dioxide (TiO2) is a promising material for optoelectronic devices.
• Existing methods for TiO2 nanostructure fabrication can be complex and costly.

Purpose of the Study:

• To report a novel, feasible, and cost-effective method for preparing one-dimensional (1D) TiO2 nanowire arrays.
• To fabricate a high-performance ultraviolet (UV) photodetector on a flexible substrate using the synthesized TiO2 nanowires.
• To investigate the performance characteristics and potential applications of the TiO2 nanowire-based photodetector.

Main Methods:

• Utilized a super-aligned carbon nanotube film as a template for scalable synthesis of TiO2 nanowires.
• Prepared pure-anatase-phase TiO2 nanowires in a suspended manner.
• Fabricated UV photodetectors on flexible substrates using the TiO2 nanowire arrays.

Main Results:

• Achieved high detectivity (1.35 × 10^16 Jones) and ultrahigh photo gain (2.6 × 10^4) due to the 1D nanostructure and large surface area.
• Obtained high photoresponsivity (7.7 × 10^3 A/W) under UV illumination (365 nm) at a 10 V bias, surpassing commercial detectors.
• Demonstrated polarized photodetection capability owing to the anisotropic geometry of the TiO2 nanowire array.

Conclusions:

• The developed method offers a scalable and cost-effective route for producing high-quality TiO2 nanowire arrays.
• The fabricated TiO2 nanowire photodetectors exhibit exceptional performance, including high sensitivity, gain, and responsivity.
• The findings highlight the potential of nanomaterial systems, specifically TiO2 nanowire arrays, for advanced photodetector applications.