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Large-format voltage-tunable dual-band quantum-well infrared photodetector focal plane array for third-generation thermal imagers
Date
2008-10-01
Author
Eker, S. U.
Kaldirim, M.
Arslan, Y.
Beşikci, Cengiz
Metadata
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We report a large-format (640 x 512) voltage-tunable quantum-well (QW) infrared photodetector focal plane array (FPA) for dual-band imaging in the mid- and long-wavelength infrared (MWIR and LWIR) bands. Voltage-tunable spectral response has been achieved through a series connection of eight-well MWIR AlGaAs-InGaAs and 16-well LWIR AlGaAs-GaAs QW stacks grown by molecular beam epitaxy on GaAs substrate. The peak responsivity wavelength of the detectors is shifted from 4.8 to 8.4 mu m as the bias is increased within the limit applicable by commercial read-out integrated circuits. The FPA with MWIR and LWIR cutoff wavelengths of 5.1 and 8.9 mu m provides noise equivalent temperature differences of 20 and 32 mK (f/1.5) in these bands, respectively. The results are very encouraging for the development of low-cost large-format dual-band MWIR/LWIR FPA technology.
Subject Keywords
Electrical and Electronic Engineering
,
Electronic, Optical and Magnetic Materials
URI
https://hdl.handle.net/11511/41988
Journal
IEEE ELECTRON DEVICE LETTERS
DOI
https://doi.org/10.1109/led.2008.2002538
Collections
Department of Electrical and Electronics Engineering, Article
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S. U. Eker, M. Kaldirim, Y. Arslan, and C. Beşikci, “Large-format voltage-tunable dual-band quantum-well infrared photodetector focal plane array for third-generation thermal imagers,”
IEEE ELECTRON DEVICE LETTERS
, pp. 1121–1123, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41988.