2 March 2006 Temperature coefficients and noise performance and studies for the back-illuminated arrays for medical imaging applications
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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.
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Alexander O. Goushcha, Alexander O. Goushcha, Bernd Tabbert, Bernd Tabbert, Ilja Goushcha, Ilja Goushcha, } "Temperature coefficients and noise performance and studies for the back-illuminated arrays for medical imaging applications", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61422V (2 March 2006); doi: 10.1117/12.652447; https://doi.org/10.1117/12.652447
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