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Development of 15 Micron Cutoff Wavelength HgCdTe Detector Arrays for Astronomy (Hardcover, 1st ed. 2020)
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Development of 15 Micron Cutoff Wavelength HgCdTe Detector Arrays for Astronomy (Hardcover, 1st ed. 2020)
Series: Springer Theses
Expected to ship within 10 - 15 working days
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This thesis describes advances in the understanding of HgCdTe
detectors. While long wave (15 m) infrared detectors HgCdTe
detectors have been developed for military use under high
background irradiance, these arrays had not previously been
developed for astronomical use where the background irradiance is a
billion times smaller. The main pitfall in developing such arrays
for astronomy is the pixel dark current which plagues long wave
HgCdTe. The author details work on the success of shorter
wavelength development at Teledyne Imaging Sensors, carefully
modeling the dark current-reverse bias voltage curves of their 10 m
devices at a temperature of 30K, as well as the dark
current-temperature curves at several reverse biases, including 250
mV. By projecting first to 13 and then 15 m HgCdTe growth, values
of fundamental properties of the material that would minimize
tunneling dark currents were determined through careful modeling of
the dark current-reverse bias voltage curves, as well as the dark
current-temperature curves. This analysis was borne out in the 13 m
parts produced by Teledyne, and then further honed to produce the
necessary parameters for the 15 m growth. The resulting 13 m arrays
are being considered by a number of ground-based astronomy research
groups.
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