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High performance long wavelength infrared mega-pixel focal plane array based on type-II superlattices

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5 Author(s)
Manurkar, Paritosh ; Department of Electrical Engineering and Computer Science, Center for Quantum Devices, Northwestern University, Evanston, Illinois, 60208, USA ; Ramezani-Darvish, Shaban ; Binh-Minh Nguyen ; Razeghi, M.
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A large format 1k×1k focal plane array (FPA) is realized using type-II superlattice photodiodes for long wavelength infrared detection. Material growth on a 3 in. GaSb substrate exhibits a 50% cutoff wavelength of 11 μm across the entire wafer. The FPA shows excellent imaging. Noise equivalent temperature differences of 23.6 mK at 81 K and 22.5 mK at 68 K are achieved with an integration time of 0.13 ms, a 300 K background and f/4 optics. We report a dark current density of 3.3×10-4 Acm-2 and differential resistance-area product at zero bias R0A of 166 Ω cm2 at 81 K, and 5.1×10-5 Acm-2 and 1286 Ω cm2, respectively, at 68 K. The quantum efficiency obtained is 78%.

Published in:

Applied Physics Letters  (Volume:97 ,  Issue: 19 )

Date of Publication:

Nov 2010

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