Share Email Print
cover

Proceedings Paper

Temperature coefficients and noise performance and studies for the back-illuminated arrays for medical imaging applications
Author(s): Alexander O. Goushcha; Bernd Tabbert; Ilja Goushcha
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Noise characteristics of the backlit, pin photodiode arrays having different vertical structures were studied. We showed that in many cases, the non-optical crosstalk between adjacent elements determines the noise performance and detectivity of the array pixels. For the arrays with the structure described in our recent works, the crosstalk always remained well below 0.01%, which allowed reaching the minimum noise level of ~ 10-15 A/&sqrt;Hz determined by the thermal noise. In contrast, for the arrays built applying conventional structures the crosstalk was two orders of magnitude higher, which noticeably decreased the sensitivity of the pixels increasing their noise and switching their operation towards background-limited performance. The background signal originated from the non-optical crosstalk and produced a noise level significantly higher that the thermal noise. We also compared the temperature coefficients for different arrays. For the structures with improved electrical crosstalk, the measured value of the shunt resistance temperature coefficient was typically below 8 %/C and the responsivity temperature coefficient value did not exceed +0.02%/C within the spectral range from 450 through 800 nm. The advantages and drawbacks of application of the reported in this work photodiode arrays in high quality imaging systems are discussed.

Paper Details

Date Published: 2 March 2006
PDF: 9 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61422V (2 March 2006); doi: 10.1117/12.652447
Show Author Affiliations
Alexander O. Goushcha, Semicoa (United States)
Bernd Tabbert, Semicoa (United States)
Ilja Goushcha, Semicoa (United States)


Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)

© SPIE. Terms of Use
Back to Top