Flexible Solar-Blind Ultraviolet Photodetector Based on β-Ga₂O₃ Nanowire Channel Bridge Structure: Combining High...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Solar-blind ultraviolet photodetectors offer high signal-to-noise ratios and anti-interference capabilities.
• Flexible photodetectors are crucial for high-strain applications like robotics and wearable technology.
• Existing flexible photodetectors face challenges in balancing strain stability and responsivity.

Purpose of the Study:

• To develop a flexible β-Ga2O3 nanowire photodetector on an ultra-thin silicon substrate.
• To evaluate the device's performance under bending strain, focusing on stability and responsivity.
• To explore its potential for flame detection and biological sensing applications.

Main Methods:

• Fabrication of β-Ga2O3 nanowire photodetector using microchannel engraving and chemical vapor deposition.
• Testing device responsivity and photogenerated current variation under bending strain (0-60°).
• Assessing device stability through 500 cycles of 60° bending.

Main Results:

• Achieved a responsivity of 266 mA W⁻¹ without strain.
• Demonstrated less than 5.5% variation in photogenerated current under 60° bending strain.
• Showcased excellent stability with only 1.5% change in photogenerated current after 500 bending cycles.
• Recorded a response time of 360 ms.

Conclusions:

• The flexible β-Ga2O3 nanowire photodetector exhibits excellent strain cycle stability and high responsivity.
• The device shows significant potential for applications in harsh environments, including flame detection and biological sensing.