Ultrasensitive Self-Powered Flexible Crystalline β-Ga₂O₃-Based Photodetector Obtained through Lattice Symmetry and...

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Flexible semiconductor devices, particularly those based on Gallium Oxide (Ga₂O₃), are attractive for adaptable electronics.
• Existing flexible Ga₂O₃ heterojunctions often use amorphous or low-quality crystalline materials, hindering device performance.

Purpose of the Study:

• To engineer a high-quality crystalline flexible NiO/β-Ga₂O₃ p-n heterojunction for self-powered photodetector applications.
• To enhance the performance and mechanical stability of Ga₂O₃-based flexible devices.

Main Methods:

• Utilized lattice-symmetry and energy-band alignment engineering to construct the NiO/β-Ga₂O₃ heterojunction.
• Fabricated a flexible self-powered photodetector device.
• Evaluated device performance under zero bias and mechanical bending conditions.

Main Results:

• Achieved a high photo-to-dark current ratio of 1.71 × 10⁵ and a detection sensitivity of 6.36 × 10¹⁴ Jones under zero bias.
• Demonstrated superior performance compared to many existing Ga₂O₃ self-powered photodetectors, including those on rigid substrates.
• Exhibited excellent mechanical stability and robustness when subjected to bending.

Conclusions:

• The engineered NiO/β-Ga₂O₃ heterojunction provides a pathway for high-performance flexible self-powered photodetectors.
• Findings offer insights into crystal lattice and energy band engineering for flexible optoelectronic devices.
• The developed technology shows potential for practical applications in flexible electronics.