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Proceedings Paper

Electrical characterization of prototype DEPFET detectors for Athena's Wide Field Imager
Author(s): Michael Bonholzer; Robert Andritschke; Valentin Emberger; Norbert Meidinger; Johannes Müller-Seidlitz; Wolfgang Treberspurg
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Paper Abstract

The Wide Field Imager (WFI), one of two complementary instruments on board ESA's next large X-ray mission Athena, combines state-of-the-art resolution spectroscopy with a large field of view and high count rate capability. Centerpiece of the WFI instrument are four DEPFET (Depleted p-channel field effect transistor) sensors with a size of 512_512 pixels each and one fast detector with a size of 64_64 pixels. They are planned to be operated in drain current readout mode, which enables fast readout rates but is sensitive to inhomogeneities of the drain currents. These inhomogeneities arise from the sheer size of the DEPFET sensor matrix and are originated in the spatial distribution of wafer properties and process parameters. We characterized the drain current distribution of a prototype device (64_64 pixels) utilizing the same layout and technology as specified for the pre-flight production of Athena's WFI DEPFET detectors. In order to better understand the origin of the current spread we measured I-V characteristics of all pixels and extracted threshold voltages and transconductance values of the detector in operational conditions. This is enabled by features of the VERITAS read-out ASIC.

Paper Details

Date Published: 9 September 2019
PDF: 9 pages
Proc. SPIE 11118, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI, 111180F (9 September 2019); doi: 10.1117/12.2528403
Show Author Affiliations
Michael Bonholzer, Max-Planck-Institut für extraterrestrische Physik (Germany)
Robert Andritschke, Max-Planck-Institut für extraterrestrische Physik (Germany)
Valentin Emberger, Max-Planck-Institut für extraterrestrische Physik (Germany)
Norbert Meidinger, Max-Planck-Institut für extraterrestrische Physik (Germany)
Johannes Müller-Seidlitz, Max-Planck-Institut für extraterrestrische Physik (Germany)
Wolfgang Treberspurg, Max-Planck-Institut für extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 11118:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI
Oswald H. Siegmund, Editor(s)

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