Quantifying the performance of a hybrid pixel detector with GaAs:Cr sensor for transmission electron microscopy

Paton, K. A. , Veale, M. C., Mu, X., Allen, C. S., Maneuski, D., Kubel, C., O’Shea, V., Kirkland, A. I. and McGrouther, D. (2021) Quantifying the performance of a hybrid pixel detector with GaAs:Cr sensor for transmission electron microscopy. Ultramicroscopy, 227, 113298. (doi: 10.1016/j.ultramic.2021.113298)

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Abstract

Hybrid pixel detectors (HPDs) have been shown to be highly effective for diffraction-based and time-resolved studies in transmission electron microscopy, but their performance is limited by the fact that high-energy electrons scatter over long distances in their thick Si sensors. An advantage of HPDs compared to monolithic active pixel sensors is that their sensors do not need to be fabricated from Si. We have compared the performance of the Medipix3 HPD with a Si sensor and a GaAs:Cr sensor using primary electrons in the energy range of 60 - 300 keV. We describe the measurement and calculation of the detectors’ modulation transfer function (MTF) and detective quantum efficiency (DQE), which show that the performance of the GaAs:Cr device is markedly superior to that of the Si device for high-energy electrons.

Item Type:Articles
Additional Information:The authors gratefully acknowledge funding from the UK Science and Technology Facilities Council through the Industrial Cooperative Awards in Science & Technology (CASE) studentship “Next2 Detection - Investigation of Hybrid Pixel Detectors for Future Transmission Electron Microscopy Imaging” (grant no. ST/P002471/1). X.M. thanks Deutsche Forschungsgemeinschaft (DFG) for funding (grant no. MU 4276/1-1). K.A.P and D.McG. acknowledge Quantum Detectors Ltd. for funding travel to KNFC as part of the Industrial CASE studentship that supports K.A.P.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McGrouther, Dr Damien and Paton, Ms Kirsty and Maneuski, Dr Dima
Authors: Paton, K. A., Veale, M. C., Mu, X., Allen, C. S., Maneuski, D., Kubel, C., O’Shea, V., Kirkland, A. I., and McGrouther, D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Ultramicroscopy
Publisher:Elsevier
ISSN:0304-3991
ISSN (Online):1879-2723
Published Online:29 April 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Ultramicroscopy 227: 113298
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
ST/P002471/1