Infrared focal plane arrays (FPAs) covering broad mid- and long-IR spectral ranges are the central parts of the
spectroscopic and imaging instruments in several Earth and planetary science missions. To be implemented in the space
instrument these FPAs need to be large-format, uniform, reproducible, low-cost, low 1/f noise, and radiation hard.
Quantum Well Infrared Photodetectors (QWIPs), which possess all needed characteristics, have a great potential for
implementation in the space instruments. However a standard QWIP has only a relatively narrow spectral coverage. A
multi-color QWIP, which is compromised of two or more detector stacks, can to be used to cover the broad spectral
range of interest. We will discuss our recent work on development of multi-color QWIP for Hyperspectral Thermal
Emission Spectrometer instruments. We developed QWIP compromising of two stacks centered at 9 and 10.5 μm, and
featuring 9 grating regions optimized to maximize the responsivity in the individual subbands across the 7.5-12 μm
spectral range. The demonstrated 1024x1024 QWIP FPA exhibited excellent performance with operability exceeding
99% and noise equivalent differential temperature of less than 15 mK across the entire 7.5-12 μm spectral range.