IRFPA-V - Mono- and bispectral type II superlattices Focal plane arrays for thermal infrared

© Fraunhofer IAF
Processed 3-inch wafer with LWIR superlattice matrix detectors with a spatial resolution of 640 x 512 pixels and test structures at the edge.

In order to reduce the weight, size and power consumption as well as to increase the detection and identification range of infrared thermal imaging systems and warning sensors of the next generation, Fraunhofer IAF is developing mono- and bi-spectral antimonidic type II superlattice matrix detectors for the two atmospheric transmission windows 3 − 5 µm (MWIR, mid-wavelength infrared) and 8 − 12 µm (LWIR, long-wavelength infrared). For this purpose, we are developing novel heterostructure devices featuring a magnitude reduction in dark current in comparison with conventional photodiodes. This enables a significantly higher operating temperature of the focal plane array, so that smaller and lighter refrigerator units with reduced power consumption can be used without losses of electro-optical system performance.

Project title IRFPA-V − Type II superlattice matrix detectors for mono- and bispectral infrared focal plane arrays with small pitch and high operating temperature
Project duration 2015 − 2018  
Funding source Federal Ministry of Defense  
Project partner AIM Infrarot-Module GmbH, Heilbronn  
Project manager Dr. Robert Rehm  
  • Pre-development of core components for future warning systems for the protection of flying platforms
  • Development of heterostructure devices with reduced dark current based on InAs / GaSb type II superlattices
  • Increase the operating temperature and reduce the inherent noise of MWIR superlattice detectors
  • Development of the manufacturing technology for LWIR matrix detectors with a small grid size construction and connection technology for focal plane arrays