Study of silicon sensor thickness optimization for LSST

P. O'Connor; V. Radeka; D. Figer; J. G. Geary; D. K. Gilmore; J. Oliver; C. W. Stubbs; P. Z. Takacs; J. A. Tyson

doi:10.1117/12.673393

15 June 2006 Study of silicon thickness optimization for LSST

P. O'Connor, V. Radeka, D. Figer, J. G. Geary, D. K. Gilmore, J. Oliver, C. W. Stubbs, P. Z. Takacs, J. A. Tyson

Proceedings Volume 6276, High Energy, Optical, and Infrared Detectors for Astronomy II; 62761W (2006) https://doi.org/10.1117/12.673393
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

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.

Citation Download Citation

P. O'Connor, V. Radeka, D. Figer, J. G. Geary, D. K. Gilmore, J. Oliver, C. W. Stubbs, P. Z. Takacs, and J. A. Tyson "Study of silicon thickness optimization for LSST", Proc. SPIE 6276, High Energy, Optical, and Infrared Detectors for Astronomy II, 62761W (15 June 2006); https://doi.org/10.1117/12.673393

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