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  Drain current characteristics of Athena WFI flight-like DEPFETs

Bonholzer, M., Andritschke, R., Emberger, V., Hauser, G., & Müller-Seidlitz, J. (2022). Drain current characteristics of Athena WFI flight-like DEPFETs. In Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray. doi:10.1117/12.2628862.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000C-9EED-8 Version Permalink: https://hdl.handle.net/21.11116/0000-000C-9EEE-7
Genre: Conference Paper

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 Creators:
Bonholzer, Michael1, Author           
Andritschke, Robert1, Author           
Emberger, Valentin1, Author           
Hauser, Günter1, Author           
Müller-Seidlitz, Johannes1, Author           
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1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 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 is the large detector assembly consisting of 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 large detector lab module (one quadrant of the large detector assembly, 512×512 pixels) out of 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 the channel length modulation parameters, threshold voltages and transconductance values of the external (gm) and internal (gq) gate of the individual pixels of the detector in operational conditions. This is enabled by features of the VERITAS readout ASIC.

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Language(s): eng - English
 Dates: 2022-08-31
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
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 Identifiers: DOI: 10.1117/12.2628862
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Title: SPIE Astronomical Telescopes + Instrumentation,
Place of Event: Montréal, Québec, Canada
Start-/End Date: 2022-07-17 - 2022-07-23

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Title: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray
Source Genre: Proceedings
 Creator(s):
Nakazawa, Kazuhiro, Author
Nikzad, Shouleh , Author
A. den Herder, Jan-Willem , Author
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Pages: - Volume / Issue: 12181 Sequence Number: - Start / End Page: - Identifier: -

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Title: Proceedings of SPIE
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Publ. Info: Bellingham, WA, USA : Society of Photo-Optical Instrumentation Engineers
Pages: - Volume / Issue: - Sequence Number: 121813V Start / End Page: - Identifier: ISSN: 0277-786X