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Proceedings Paper

Studies of prototype DEPFET sensors for the Wide Field Imager of Athena
Author(s): Wolfgang Treberspurg; Robert Andritschke; Alexander Bähr; Annika Behrens; Günter Hauser; Peter Lechner; Norbert Meidinger; Johannes Müller-Seidlitz; Johannes Treis
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Paper Abstract

The Wide Field Imager (WFI) of ESA’s next X-ray observatory Athena will combine a high count rate capability with a large field of view, both with state-of-the-art spectroscopic performance. To meet these demands, specific DEPFET active pixel detectors have been developed and operated. Due to the intrinsic amplification of detected signals they are best suited to achieve a high speed and low noise performance. Different fabrication technologies and transistor geometries have been implemented on a dedicated prototype production in the course of the development of the DEPFET sensors. The main modifications between the sensors concern the shape of the transistor gate – regarding the layout – and the thickness of the gate oxide – regarding the technology. To facilitate the fabrication and testing of the resulting variety of sensors the presented studies were carried out with 64×64 pixel detectors. The detector comprises a control ASIC (Switcher-A), a readout ASIC (VERITAS- 2) and the sensor. In this paper we give an overview on the evaluation of different prototype sensors. The most important results, which have been decisive for the identification of the optimal fabrication technology and transistor layout for subsequent sensor productions are summarized. It will be shown that the developments result in an excellent performance of spectroscopic X-ray DEPFETs with typical noise values below 2.5 ENC at 2.5 μs/row.

Paper Details

Date Published: 29 August 2017
PDF: 10 pages
Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 103970U (29 August 2017); doi: 10.1117/12.2274032
Show Author Affiliations
Wolfgang Treberspurg, Max-Planck-Institut for Extraterrestrial Physics (Germany)
Robert Andritschke, Max-Planck-Institut for Extraterrestrial Physics (Germany)
Alexander Bähr, Semiconductor Lab. of the Max-Planck-Society (Germany)
Annika Behrens, Max-Planck-Institut for Extraterrestrial Physics (Germany)
Günter Hauser, Max-Planck-Institut for Extraterrestrial Physics (Germany)
Peter Lechner, Semiconductor Lab. of the Max-Planck-Society (Germany)
Norbert Meidinger, Max-Planck-Institut for Extraterrestrial Physics (Germany)
Johannes Müller-Seidlitz, Max-Planck-Institut for Extraterrestrial Physics (Germany)
Johannes Treis, Semiconductor Lab. of the Max-Planck-Society (Germany)

Published in SPIE Proceedings Vol. 10397:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX
Oswald H. Siegmund, Editor(s)

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