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Calibration of image persistence in HgCdTe photodiodes

Smith, Roger M. and Zavodny, Maximilian and Rahmer, Gustavo and Bonati, Marco (2008) Calibration of image persistence in HgCdTe photodiodes. In: High Energy, Optical, and Infrared Detectors for Astronomy III. Proceedings of SPIE. No.7021. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 70210K. ISBN 9780819472311.

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Image persistence can produce systematic errors, which remain significant in some applications even when buried in noise. Ideally the image persistence amplitude, linearity and decay over time could be calibrated independently for each pixel to levels well below the noise floor, however averaging multiple measurements to characterize persistence to this accuracy is impractical due to the long time scales for the decay and the need to emulate the exposure and readout timing of the observations to be calibrated. We examine a compromise where the initial persistence response is characterized independently for each pixel but the latter parts of the decay are assumed to follow the mean decay curve. When averaged spatially, persistence increases monotonically with stimulus amplitude until the photodiodes approach forward bias. For several Teledyne 1.7 μm cutoff HgCdTe detectors tested, persistence is linear over most of the normal signal range. We characterize the temporal response, and examine the dependence of charge emission time constants on total stimulus duration. We describe the suppression of persistence by signal in the current frame and begin to examine the superposition of the decay curves from multiple stimuli.

Item Type:Book Section
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Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers (SPIE). This work was supported by the Director, Office of Science, Office of High Energy Physics, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-05CH11231
Subject Keywords:remnant image, HgCdTe, 1.7 μm cutoff, depletion region, charge trap, calibration
Series Name:Proceedings of SPIE
Issue or Number:7021
Record Number:CaltechAUTHORS:20180619-104618211
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Official Citation:Roger M. Smith, Maximilian Zavodny, Gustavo Rahmer, Marco Bonati, "Calibration of image persistence in HgCdTe photodiodes", Proc. SPIE 7021, High Energy, Optical, and Infrared Detectors for Astronomy III, 70210K (22 July 2008); doi: 10.1117/12.789619;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87223
Deposited By: George Porter
Deposited On:19 Jun 2018 18:11
Last Modified:15 Nov 2021 20:46

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