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Quantifying the Performance of a Hybrid Pixel Detector with GaAs:Cr Sensor for Transmission Electron Microscopy

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arxiv 2009.14565 v1 pith:6EWXVPP2 submitted 2020-09-30 physics.ins-det cond-mat.mtrl-sci

Kirsty A. Paton , Matthew C. Veale , Xiaoke Mu , Christopher S. Allen , Dzmitry Maneuski , Christian Kübel , Val O'Shea , Angus I. Kirkland
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Damien McGrouther
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classification physics.ins-detcond-mat.mtrl-sci
keywords performancesensorelectronsgaaspixelcompareddetectorsdevice
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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 (MAPS) is that their sensor does not need to be fabricated from Si. We have compared the performance of the Medipix3 HPD with a Si sensor and with a GaAs:Cr sensor using primary electrons in the energy range of 60 - 300keV. 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.

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