Solution-Grown Nanowire Devices for Sensitive and Fast Photodetection

Area of Science:

• Materials Science
• Nanotechnology
• Device Physics

Background:

• Photodetector devices are crucial for various optical applications.
• Developing highly sensitive and fast photodetectors remains a key challenge.
• Quantum nanowires offer unique electronic and optical properties for device applications.

Purpose of the Study:

• To develop highly sensitive and fast photodetector devices.
• To utilize cadmium selenide (CdSe) quantum nanowires as active elements.
• To explore efficient synthesis routes for CdSe quantum nanowires.

Main Methods:

• Electro- and wet-chemical synthesis routes were employed.
• Bismuth nanoparticles were used as catalysts for solution-liquid-solid synthesis of CdSe quantum nanowires.
• Quantum nanowires were grown directly on interdigitated platinum electrodes.

Main Results:

• Photodetector devices with CdSe quantum nanowires demonstrated high sensitivity (on/off ratio > 10^7) up to 700 nm.
• Specific detectivity (D*) reached 4 × 10^13 Jones and responsivity (R) was 0.32 A/W.
• The devices exhibited fast response times with a 3 dB frequency above 1 MHz and rise/fall times below 350 ns.

Conclusions:

• The developed photodetector devices combine high sensitivity and fast response.
• The performance is attributed to depletion regions, tunnel barriers, and Schottky contacts within the nanowire network.
• This work presents a promising approach for advanced photodetector fabrication.