One-dimensional CuO nanowire: synthesis, electrical, and optoelectronic devices application

Area of Science:

• Materials Science
• Nanotechnology
• Condensed Matter Physics

Background:

• One-dimensional nanostructures are crucial for advanced electronic and optoelectronic devices.
• Copper oxide (CuO) is a promising semiconductor material with potential applications in nanodevices.
• Developing efficient synthesis methods for high-quality CuO nanowires (NWs) is essential.

Purpose of the Study:

• To synthesize one-dimensional CuO NWs using a surface mechanical attrition treatment (SMAT)-assisted approach.
• To investigate the electrical properties and light sensitivity of individual CuO NWs.
• To explore the potential of CuO NWs in flexible optoelectronic devices.

Main Methods:

• Synthesis of CuO NWs via SMAT.
• Fabrication and characterization of nanofield-effect transistors (nanoFETs) using individual CuO NWs.
• First-principle calculations to understand electrical conduction mechanisms.
• Performance evaluation of CuO NW-based photodetectors under various conditions, including bending.

Main Results:

• SMAT yielded CuO NWs with diameters of 50–200 nm and lengths of 5–20 μm, oriented along the [110] direction.
• Individual CuO NWs exhibited p-type semiconducting behavior with high hole mobility (0.129 cm²V⁻¹s⁻¹) and concentration (1.34 × 10¹⁸ cm⁻³), attributed to oxygen vacancies.
• The CuO NW devices demonstrated high sensitivity to visible light (peak sensitivity at 600 nm) with excellent responsivity (2.0 × 10² A W⁻¹), conductive gain (3.95 × 10²), and detectivity (6.38 × 10¹¹ cm Hz¹/² W⁻¹).
• Nanophotodetectors fabricated on flexible PET substrates maintained good performance under bending, showing high reproducibility.

Conclusions:

• The SMAT-assisted synthesis provides a viable route to high-quality CuO NWs for nanodevices.
• The p-type conduction and excellent optoelectronic properties of CuO NWs make them suitable for high-performance applications.
• Flexible CuO NW-based photodetectors show promise for wearable and adaptable optoelectronic systems.