Multi-Color Quantum Well Infrared Photodetectors for Mid-, Long-, and Very Long- Wavelength Infrared Applications
FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
Pagination or Media Count:
Quantum well infrared photodetectors QWIPs have been widely investigated for the 3 - 5 micrometers mid-wavelength infrared MWIR and 8 - 12 micrometers long-wavelength infrared LWIR atmospheric spectral windows as well as very long wavelength infrared VLWIR lambdasub c 14 micrometers detection in the past decade. The mature III-V compound semiconductor growth technology and the design flexibility of device structures have led to the rapid development of various QWIP structures for infrared focal plane arrays FPAs applications. In addition to the single-color QWIP with narrow bandwidth, the multi-color QWIP required for advanced IR sensing and imaging applications have also been emerged in recent years. Using band gap engineering approach, the multi-color 2, 3, and 4- color QWIPs using multi-stack quantum wells with different well width and depth and voltage-tunable triple-coupled quantum well TCQW structure for detection in the MWIR, LWIR, and VLWIR bands have been demonstrated. In this paper, the design, fabrication, and characterization of a voltage-tunable 2-stack 3-color QWIP for MWLWLW IR detection and a 3-stack 3-color QWIP for detection in the water, ozone, and CO2 atmospheric blocking bands are depicted.
- Infrared Detection and Detectors
- Solid State Physics