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Proceedings Paper

Directly-deposited blocking filters for high-performance silicon x-ray detectors
Author(s): M. Bautz; S. Kissel; R. Masterson; K. Ryu; V. Suntharalingam
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Paper Abstract

Silicon X-ray detectors often require blocking filters to mitigate noise and out-of-band signal from UV and visible backgrounds. Such filters must be thin to minimize X-ray absorption, so direct deposition of filter material on the detector entrance surface is an attractive approach to fabrication of robust filters. On the other hand, the soft (E < 1 keV) X-ray spectral resolution of the detector is sensitive to the charge collection efficiency in the immediate vicinity of its entrance surface, so it is important that any filter layer is deposited without disturbing the electric field distribution there. We have successfully deposited aluminum blocking filters, ranging in thickness from 70 to 220nm, on back-illuminated CCD X-ray detectors passivated by means of molecular beam epitaxy. Here we report measurements showing that directly deposited filters have little or no effect on soft X-ray spectral resolution. We also find that in applications requiring very large optical density (> OD 6) care must be taken to prevent light from entering the sides and mounting surfaces of the detector. Our methods have been used to deposit filters on the detectors of the REXIS instrument scheduled to fly on OSIRIS-ReX later this year.

Paper Details

Date Published: 18 July 2016
PDF: 8 pages
Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99054C (18 July 2016); doi: 10.1117/12.2232905
Show Author Affiliations
M. Bautz, Massachusetts Institute of Technology Kavli Institute for Astrophysics and Space Research (United States)
S. Kissel, Massachusetts Institute of Technology Kavli Institute for Astrophysics and Space Research (United States)
R. Masterson, Massachusetts Institute of Technology (United States)
K. Ryu, Massachusetts Institute of Technology Lincoln Lab. (United States)
V. Suntharalingam, Massachusetts Institute of Technology Lincoln Lab. (United States)


Published in SPIE Proceedings Vol. 9905:
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Tadayuki Takahashi; Marshall Bautz, Editor(s)

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