Chauhan, D, Perera, AGU, Li, L et al. (2 more authors) (2017) Dark current and photoresponse characteristics of extended wavelength infrared photodetectors. Journal of Applied Physics, 122 (2). 024501. ISSN 0021-8979
Abstract
The dark current and spectral photoresponse thresholds of a semiconductor photodetector are normally determined by the minimum energy gap (Δ) of the material, or the interfacial energy gap of the heterostructure. In this manuscript, we discuss the performance of an asymmetric p-GaAs/AlₓGa1-ₓAs heterostructure-based infrared photodetector, which shows an extended wavelength threshold beyond the limit set by Δ. The measured dark current was found to agree well with fits obtained from a 3D carrier drift model using the designed value of Δ ∼ 0.40 eV (∼3.1 μm). In contrast, the spectral photoresponse showed extended wavelength thresholds of ∼68 μm, ∼45 μm, and ∼60 μm at positive, zero, and negative biases, respectively, at 5.3 K. For a reference (symmetric) photodetector, the dark current was fitted with the designed value of Δ ∼0.30 eV, and excellent agreement was obtained for both the measured dark current and spectral response. This underlies the advantage of using asymmetric infrared photo-detector designs, in which an extension to the detected wavelengths can be obtained with little compromise to the dark current characteristics.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © The Authors 2017. Published by AIP Publishing. The following article appeared in Chauhan, D, et al. (2017) Dark current and photoresponse characteristics of extended wavelength infrared photodetectors. Journal of Applied Physics, 122 (2). 024501 and may be found at https://doi.org/10.1063/1.4992075. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. |
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) |
Funding Information: | Funder Grant number EU - European Union 247375 Royal Society WM150029 |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Jul 2017 09:10 |
Last Modified: | 10 Jul 2018 08:52 |
Status: | Published |
Publisher: | American Institute of Physics |
Identification Number: | 10.1063/1.4992075 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:119245 |