Metal-insulator-semiconductor photodetectors

Area of Science:

• Optoelectronics
• Semiconductor device physics

Background:

• Solar radiation spans ultraviolet, visible, and infrared regions, necessitating detection across these spectra.
• Photodetectors are crucial for human applications and technological advancements.
• Existing photodetector technologies like pn-junction and Metal-Semiconductor-Metal (MSM) have limitations.

Purpose of the Study:

• To highlight the development and capabilities of metal-insulator-semiconductor (MIS) photodetectors.
• To showcase MIS photodetectors' suitability for detecting solar radiation across UV, visible, and infrared regions.
• To compare MIS photodetectors with pn-junction and MSM photodetectors.

Main Methods:

• Development of III-V MIS photodetectors for ultraviolet detection.
• Implementation of Silicon (Si) and Germanium (Ge) MIS photodetectors for visible-light and near-infrared detection.
• Engineering of MIS SiGe/Si quantum dot infrared photodetectors for mid- and long-wavelength infrared detection.

Main Results:

• III-V MIS photodetectors demonstrate high UV-to-visible rejection ratios.
• Si and Ge MIS photodetectors successfully enable visible-light detection and near-infrared optical communications.
• MIS SiGe/Si quantum dot infrared photodetectors cover atmospheric transmission windows for infrared detection.

Conclusions:

• MIS photodetectors offer a simpler fabrication process and lower dark current compared to pn-junction and MSM photodetectors, respectively.
• MIS photodetectors are a promising technology for broad-spectrum light detection, from UV to long-wavelength infrared.
• The developed MIS photodetectors are suitable for diverse applications including UV detection, optical communications, and infrared sensing.