Si-based gesn short-wave infrared photodetectors
High-performance, low-cost Si-based GeSn SWIR photodetectors with extended photodetection range and improved quantum efficiency through advanced growth and fabrication techniques, aiming to achieve a detection range up to 2400 nm.
Overview
This innovative solution leverages group-IV GeSn alloys to develop high-performance, cost-effective short-wave infrared (SWIR) photodetectors that are compatible with silicon (Si) and CMOS processing. By incorporating tin (Sn) into germanium (Ge), the technology extends the photodetection range to the SWIR region, up to 2400 nm. This makes it particularly suitable for applications requiring extended range detection and high quantum efficiency, ideal for fields such as telecommunications, imaging, and environmental sensing.
Technical specifications
- Material Composition: GeSn alloys with Sn content up to 10% extend the photodetection range significantly.
- Photodetection Range: Efficient detection in the 900-1700 nm range, extendable to ~2400 nm.
- Quantum Efficiency: Currently achieving ~20% in the 900-1700 nm range, with potential improvement through anti-reflection layers and increased active layer thickness.
- Dark Current Density: Optimization efforts are focused on lowering dark current to below 3,000 nA/cm² through improved material quality and device fabrication, including passivation techniques.
Technology readiness level
Currently at TRL 4, this technology has reached the stage of validation in a laboratory environment. Future efforts will focus on optimizing the growth process and device fabrication to enhance performance, including I-V characterization and responsivity enhancement.
About National Chung Cheng University
National Chung Cheng University is a mid-sized national public research university in Minxiong, Chiayi County, Taiwan, with a comprehensive academic and research mission and approximately 12,000 students. Its Office of Research and Development provides industry-academic collaboration support for external research, partnerships, and talent development. An innovation and entrepreneurship base, technology-transfer support, and links to nearby industrial parks give companies channels for joint development, commercialization, internships, and emerging talent. Located in southern Taiwan, CCU connects with regional manufacturing and technology ecosystems. Research is supported by competitive funding from Taiwan’s National Science and Technology Council, Ministry of Education, and Ministry of Economic Affairs.
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