Key elements for hybridization technology development of $2000\times 2000$ pixels Infrared Focal Plane Arrays

Lynred develops infrared imaging sensors covering the entire infrared spectrum (SWIR, MWIR, LWIR, and VLWIR) through a variety of technologies including MCT (mercury cadmium telluride). Today with the increasing demand for better spatial resolution we observe the emergence of very large arrays detectors with ultra-fine pitch. The hybridization of such IR detector array onto a readout circuit represents one of the major limiting factors for the development of these detectors. Lynred has recently developed 2000×2000 pixels IR detectors down to 15 μm and 10 μm pitches, with successful and reproducible hybridization processes. In this paper we describe the main barriers and solutions put in place in order to realize these detectors, and the resulting prototypes are illustrated.