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Standard GaAs/AlGaAs Quantum Well Infrared Photodetectors (QWIP) are considered as a technological choice for
3rdgeneration thermal imagers [1], [2].
Since 2001, the THALES Group has been manufacturing sensitive arrays using AsGa based QWIP technology at
THALES Research and Technology Laboratory. This QWIP technology allows the realization of large staring arrays
for Thermal Imagers (TI) working in the Infrared region of the spectrum. The main advantage of this GaAs detector
technology is that it is also used for other commercial devices. The GaAs industry has lead to important improvements
over the last ten years and it reaches now an undeniable level of maturity. As a result the key parameters to reach high
production yield: large substrate and good uniformity characteristics, have already been achieved. Considering
defective pixels, the main usual features are a high operability (> 99.9%) and a low number of clusters having a
maximum of 4 dead pixels.
Another advantage of this III-V technology is the versatility of the design and processing phases. It allows
customizing both the quantum structure and the pixel architecture in order to fulfill the requirements of any specific
applications. The spectral response of QWIPs is intrinsically resonant but the quantum structure can be designed for a
given detection wavelength window ranging from MWIR, LWIR to VLWIR.
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Eric Costard, Jean P. Truffer, Odile Huet, Lydie Dua, Alexandre Nedelcu, J. A. Robo, Xavier Marcadet, Nadia Brèire de l'Isle, Philippe Bois, "QWIP from 4µm up to 18µm," Proc. SPIE 6361, Sensors, Systems, and Next-Generation Satellites X, 636117 (3 October 2006); https://doi.org/10.1117/12.693476