Afterpulsing in Ge-on-Si single-photon avalanche diodes

Yi, X. et al. (2023) Afterpulsing in Ge-on-Si single-photon avalanche diodes. IEEE Photonics Technology Letters, 35(7), pp. 959-962. (doi: 10.1109/lpt.2023.3289653)

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In this letter, we investigate afterpulsing in 26 and 100 μm diameter planar geometry Ge-on-Si single-photon avalanche diode (SPAD) detectors, by use of the double detector gating method with a gate width of 50 ns. Ge-on-Si SPADs were found to exhibit a 1% afterpulsing probability at a delay time of 200 μs and temperature of 78 K, and 130 μs at a temperature of 150 K. These delay times were measured with an excess bias of 3.5% applied, which corresponded to a single-photon detection efficiency of 15% at 1.31 μm . We demonstrate that reducing the detector diameter can also be an effective way to restrict afterpulsing in this material system.

Item Type:Articles
Additional Information:This work was supported in part by Royal Academy of Engineering (RF201819-18-187, CiET2021_123); Innovate UK (17706, 44835); Defence Science and Technology Laboratory (DSTLX-1000092774); Engineering and Physical Sciences Research Council (UK EPSRC EP/N003446/1, EP/S026428/1, EPN003225/1, EP/T001011/1, EP/T00097X/1).
Glasgow Author(s) Enlighten ID:Dumas, Dr Derek and Ferre Llin, Dr Lourdes and Kirdoda, Mr Jaroslaw and Paul, Professor Douglas and Millar, Dr Ross
Authors: Yi, X., Greener, Z., Fleming, F., Kirdoda, J., Dumas, D. C. S., Saalbach, L., Muir, D. A. S., Ferre-Llin, L., Millar, R. W., Paul, D. J., and Buller, G. S.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Photonics Technology Letters
Publisher:Institute of Electrical and Electronics Engineers (IEEE)
ISSN (Online):1941-0174
Published Online:26 June 2023
Copyright Holders:Copyright © 2023 IEEE
First Published:First published in IEEE Photonics Technology Letters 35(7):959-962
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
305161Germanium Tin Quantum DetectorsRoss MillarRoyal Academy of Engineering (RAE)RF/201819/18/187ENG - Electronics & Nanoscale Engineering
309639Single Photon Infrared Imaging, Detection and RangingDouglas PaulInnovate UK (INNOVATE)44835ENG - Electronics & Nanoscale Engineering
171911Engineering Quantum Technology Systems on a Silicon PlatformDouglas PaulEngineering and Physical Sciences Research Council (EPSRC)EP/N003225/1ENG - Electronics & Nanoscale Engineering
305753Quantum Communications hub Phase 2Robert HadfieldEngineering and Physical Sciences Research Council (EPSRC)EP/T001011/1ENG - Electronics & Nanoscale Engineering
305567QuantIC - The UK Quantum Technoogy Hub in Quantum Enhanced ImagingMiles PadgettEngineering and Physical Sciences Research Council (EPSRC)EP/T00097X/1P&S - Physics & Astronomy