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Proceedings Paper

Study of silicon sensor thickness optimization for LSST
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Paper Abstract

Sensors for the LSST camera require high quantum efficiency (QE) extending into the near-infrared. A relatively large thickness of silicon is needed to achieve this extended red response. However, thick sensors degrade the point spread function (PSF) due to diffusion and to the divergence of the fast f/1.25 beam. In this study we examine the tradeoff of QE and PSF as a function of thickness, wavelength, temperature, and applied electric field for fully-depleted sensors. In addition we show that for weakly absorbed long-wavelength light, optimum focus is achieved when the beam waist is positioned slightly inside the silicon.

Paper Details

Date Published: 15 June 2006
PDF: 14 pages
Proc. SPIE 6276, High Energy, Optical, and Infrared Detectors for Astronomy II, 62761W (15 June 2006); doi: 10.1117/12.673393
Show Author Affiliations
P. O'Connor, Brookhaven National Lab. (United States)
V. Radeka, Brookhaven National Lab. (United States)
D. Figer, Space Telescope Science Institute (United States)
J. G. Geary, Harvard-Smithsonian Ctr. for Astrophysics (United States)
D. K. Gilmore, Stanford Linear Accelerator Ctr. (United States)
J. Oliver, Harvard Univ., Lab. for Particle Physics and Cosmology (United States)
C. W. Stubbs, Harvard Univ. (United States)
P. Z. Takacs, Brookhaven National Lab. (United States)
J. A. Tyson, Univ. of California, Davis (United States)

Published in SPIE Proceedings Vol. 6276:
High Energy, Optical, and Infrared Detectors for Astronomy II
David A. Dorn; Andrew D. Holland, Editor(s)

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