Pitigala, PKDDP, Lao, YF, Perera, AGU et al. (3 more authors) (2014) Performance improvements of a split-off band infra-red detector using a graded barrier. Journal of Applied Physics, 115 (6). 063105. ISSN 0021-8979
Abstract
Uncooled split-off band infrared detectors have been demonstrated with an operational device response in the 3–5 μm range. We have shown that it is possible to enhance this device response through reducing the recapture rate by replacing one of the commonly used flat barriers in the device with a graded barrier, which was grown using a “digital alloying” approach. Responsivity of approximately 80 μA/W (D* = 1.4 × 108 Jones) were observed at 78 K under a 1 V applied bias, with a peak response at 2.8 μm. This is an improvement by a factor of ∼25 times compared to an equivalent device with a flat barrier. This enhancement is due to improved carrier transport resulting from the superlattice structure, and a low recapture rate enabled by a reduced distance to the image force potential peak in the graded barrier. The device performance can be further improved by growing a structure with repeats of the single emitter layer reported here.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2014, American Institute of Physics. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Dark currents; Alloys; Activation energies; Aluminium; Tunneling |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 May 2014 13:01 |
Last Modified: | 17 Jan 2018 21:59 |
Published Version: | http://dx.doi.org/10.1063/1.4865501 |
Status: | Published |
Publisher: | American Institute of Physics |
Identification Number: | 10.1063/1.4865501 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:78936 |