High-performance broadband, low-cost metal-semiconductor-metal π-SnS/Si photodetector

Area of Science:

• Optoelectronics
• Materials Science
• Semiconductor Devices

Background:

• Broadband photodetectors are crucial for applications like telecommunications and thermal imaging.
• Traditional multi-material heterostructures face challenges in fabrication and cost.
• Metal-semiconductor-metal (M-S-M) designs offer simpler fabrication and potential for gain.

Purpose of the Study:

• To develop a simple, cost-effective, and high-performance broadband photodetector.
• To utilize a π-SnS film as the primary photoactive material in an M-S-M configuration.
• To leverage a silicon substrate for enhanced photogeneration and carrier transport.

Main Methods:

• Chemical bath deposition of π-SnS film on a silicon substrate.
• Fabrication of a metal-semiconductor-metal (M-S-M) photodetector device.
• Characterization of photodetector performance across the 300-1000 nm wavelength range.

Main Results:

• Achieved broadband detection from 300-1000 nm.
• Exhibited a maximum responsivity of 2.42 × 10^3 mA/W and detectivity of 5.5 × 10^11 Jones.
• Demonstrated high sensitivity (3504) and fast response times (36-90 ms).

Conclusions:

• The developed π-SnS/Si M-S-M photodetector is a high-performance, cost-effective solution.
• The device's broad sensitivity and rapid response make it suitable for broadband optoelectronic applications.
• This approach simplifies photodetector fabrication while maintaining excellent performance.