Development of IR imaging at IRnova

Henk Martijn, Carl Asplund, Hedda Malm, Sergiy Smuk, Linda Höglund, Oscar Gustafsson, Mattias Hammar, Staffan Hellström
2009 Infrared Technology and Applications XXXV  
Historically IRnova has exclusively been a company, focused on manufacturing of QWIP detectors. Nowadays, besides continuous improvements of the performance of QWIP FPAs and development of new formats IRnova is involved in development of QWIP detectors for special applications and has started the development of the next generation infrared detectors, as well. In the light of the development of new formats we validate experimentally theoretical calculations of the response of QWIPs for smaller
more » ... xel size. These results allow for the development of high performance megapixel QWIP FPA that exhibit the high uniformity and operability QWIP detectors are known for. QWIP is also being considered for space applications. The requirements on dark current and operating temperature are however much more stringent as compared to the terrestrial applications. We show ways to improve the material quality with as a result a higher detector operating temperature. IRnova is also looking at antimony-based strained superlattice material for the LWIR region together with partners at the IMAGIC centre of excellence. One of the ways to overcome the problem with surface currents is passivating overgrowth. We will report the status and results of overgrowing the detector mesas with AlGa(As)Sb in a MOVPE system. At the same centre of excellence a novel material concept is being developed for LWIR detection. This new material contains a superlattice of vertically aligned and electronically coupled InAs and GaSb quantum dots. Simulations show that it should be possible to have LWIR detection in this material. We will present the current status and report results in this research. Downloaded From: http://spiedigitallibrary.org/ on 06/17/2013 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 7298 72980E-2 Downloaded From: http://spiedigitallibrary.org/ on 06/17/2013 Terms of Use: http://spiedl.org/terms SiN mask GaSb cap AlGaSb regrown Proc. of SPIE Vol. 7298 72980E-9 Downloaded From: http://spiedigitallibrary.org/ on 06/17/2013 Terms of Use: http://spiedl.org/terms
doi:10.1117/12.820162 fatcat:2uj6qye4vngkbhuaphnkuy6mli