Ultrabroadband Imaging Based on Wafer-Scale Tellurene

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• High-resolution imaging is crucial for intelligent technologies but hindered by material incompatibilities and a lack of infrared photosensitive semiconductors.
• Developing ultrabroadband imaging systems requires overcoming limitations in integrating non-silicon materials with traditional circuits.

Purpose of the Study:

• To realize monolithic integration of wafer-scale tellurene photoelectric functional units for ultrabroadband imaging.
• To develop highly sensitive photodetectors and imaging systems leveraging tellurene's unique properties.

Main Methods:

• Utilized room-temperature pulsed-laser deposition for wafer-scale tellurene integration.
• Exploited tellurene's surface plasmon polaritons for enhanced exciton separation and carrier transport.
• Engineered interconnected nanostrip morphology to promote electron-hole pair separation.

Main Results:

• Achieved wide-spectrum photoresponse from 370.6 to 2240 nm.
• Demonstrated unprecedented photosensitivity with optimized responsivity (2.7 × 10^7 A/W), external quantum efficiency (8.2 × 10^9 %), and detectivity (4.5 × 10^15 Jones).
• Successfully demonstrated an ultrabroadband imager with high-resolution photoelectric imaging capabilities.

Conclusions:

• Wafer-scale tellurene photodetectors enable ultrabroadband, high-sensitivity imaging.
• This technology presents a novel platform for advanced 2D imaging systems in intelligent equipment.
• The findings overcome previous limitations in optoelectronic material integration and infrared detection.