Wolde, S, Lao, YF, Pitigala, PKDDP et al. (4 more authors) (2016) Low-frequency noise properties of p-type GaAs/AlGaAs heterojunction detectors. Infrared Physics and Technology, 78. pp. 99-104. ISSN 1350-4495
Abstract
We have measured and analyzed, at different temperatures and bias voltages, the dark noise spectra of GaAs/AlGaAs heterojunction infrared photodetectors, where a highly doped GaAs emitter is sandwiched between two AlGaAs barriers. The noise and gain mechanisms associated with the carrier transport are investigated, and it is shown that a lower noise spectral density is observed for a device with a flat barrier, and thicker emitter. Despite the lower noise power spectral density of flat barrier device, comparison of the dark and photocurrent noise gain between flat and graded barrier samples confirmed that the escape probability of carriers (or detectivity) is enhanced by grading the barrier. The grading suppresses recombination owing to the higher momentum of carriers in the barrier. Optimizing the emitter thickness of the graded barrier to enhance the absorption efficiency, and increase the escape probability and lower the dark current, enhances the specific detectivity of devices.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Elsevier B.V. All rights reserved. This is an author produced version of a paper published in Infrared Physics and Technology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Graded barrier; Noise; AlGaAs; GaAs; Gain |
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: | 29 Sep 2016 13:08 |
Last Modified: | 22 Jul 2017 14:38 |
Published Version: | https://dx.doi.org/10.1016/j.infrared.2016.07.018 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.infrared.2016.07.018 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:105293 |