A high-performance long wavelength superlattice complementary barrier infrared detector

Ting, David Z.-Y.; Hill, Cory J.; Soibel, Alexander; Keo, Sam A.; Mumolo, Jason M.; Nguyen, Jean; Gunapala, Sarath D.
July 2009
Applied Physics Letters;7/13/2009, Vol. 95 Issue 2, p023508
Academic Journal
We describe a long wavelength infrared detector where an InAs/GaSb superlattice absorber is surrounded by a pair of electron-blocking and hole-blocking unipolar barriers. A 9.9 μm cutoff device without antireflection coating based on this complementary barrier infrared detector design exhibits a responsivity of 1.5 A/W and a dark current density of 0.99×10-5 A/cm2 at 77 K under 0.2 V bias. The detector reaches 300 K background limited infrared photodetection (BLIP) operation at 87 K, with a black-body BLIP D* value of 1.1×1011 cm Hz1/2/W for f/2 optics under 0.2 V bias.


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