Light and gas dual-function detection and mutual enhancement based on hyperdoped black silicon

Area of Science:

• Materials Science
• Nanoscience
• Chemical Sensing

Background:

• Black silicon (b-Si) is a promising material for optoelectronic applications.
• Developing dual-function detectors for simultaneous light and gas sensing is challenging.
• Nitrogen dioxide (NO2) is a key environmental pollutant requiring sensitive detection methods.

Purpose of the Study:

• To develop and characterize a novel dual-function detector based on sulfur and nitrogen co-hyperdoped black silicon.
• To investigate the synergistic effects of light illumination and NO2 gas on detector performance.
• To enhance both gas sensing and photoelectric detection capabilities of the black silicon device.

Main Methods:

• Fabrication of asymmetric light illumination detector using black silicon co-hyperdoped with sulfur and nitrogen.
• Systematic study of NO2 gas sensing properties under various light conditions.
• Evaluation of photoelectric detection properties in different NO2 gas environments.
• Analysis of mutual enhancement effects between light and gas on device performance.

Main Results:

• The dual-function detector demonstrated enhanced performance in both NO2 gas sensing and photoelectric detection.
• Gas sensor responsivity to NO2 increased 5-200 times with optimal wavelength illumination.
• Photodetector photoresponsivity increased 15-200 times in a 300 ppm NO2 environment compared to air.
• Significant mutual enhancement observed between light and NO2 gas interactions.

Conclusions:

• The developed black silicon detector offers a unique dual-function capability for light and NO2 gas detection.
• Synergistic light-gas interactions provide a novel approach to significantly improve detector performance.
• This work paves the way for advanced black silicon-based sensors with enhanced sensitivity and dual functionality.