Demonstrate high quality InAsSb metamorphic superlattices with cut-off wavelength of 12 and 16\xb5m. Validate high absorption and large hole mobility in these superlattices. Demonstrate high quantum efficiency nBn photodetector based on the new metamorphic superlattices.

Very long wavelength infrared (upto16 \xb5m, VLWIR) detectors are of great interest for Earth and Planetary Science missions such LandSat, EON-IR, NSOSA, etc. Even a modest increase in detector operating temperatures from the current 30-40K to 50-70K will provide great benefits to instrument development by reducing the size, weight and power (SWaP). Especially important for CubeSat/SmallSat. Even a modest increase in detector operating temperatures from the current 30-40K to 50-70K will provide great benefits to instrument development by reducing the size, weight and power (SWaP). This is especially important for CubeSats/SmallSats.