Candidate 10 micron HgCdTe arrays for the NEOCam space mission

McMurtry, Craig W.; Dorn, Meghan L.; Cabrera, Mario S.; Pipher, J. L.; Forrest, W. J.; Mainzer, Amy; Wong, Andre

doi:10.1117/12.2233537

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…The arrays have cut-off wavelengths of ∼ 10 µm, low read noise, high quantum efficiency (QE), and have operabilities (well depth of more than 44,000 e − and dark current less than 200 e − /s ) > 90% up to temperatures of 42 K, and have been proton irradiated and demonstrated the ability to withstand the cosmic ray radiation that they are expected to receive in space. [12][13][14] These devices have reached NASA Technical Readiness Level-6.…”

Section: Prior Development / Neocammentioning

confidence: 99%

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Development of 13-μm cutoff HgCdTe detector arrays for astronomy

Cabrera

McMurtry

Dorn

et al. 2019

J. Astron. Telesc. Instrum. Syst.

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Building on the successful development of the 10 µm HgCdTe detector arrays for the proposed NEOCam mission, the University of Rochester Infrared Detector team and Teledyne Imaging Systems are working together to extend the cutoff wavelength of HgCdTe detector arrays initially to 13 µm, with the ultimate goal of developing 15 µm HgCdTe detector arrays for space and ground-based astronomy. The advantage of HgCdTe detector arrays is that they can operate at higher temperatures than the currently used arsenic doped silicon detector arrays at the longer wavelengths. Our infrared detector team at the University of Rochester has received and tested four 13 µm detector arrays from Teledyne Imaging Systems with three different pixel designs, two of which are meant to reduce quantum tunneling dark current. The pixel design of one of these arrays has mitigated the effects of quantum tunneling dark currents for which we have been able to achieve, at a temperature of 28 K and applied bias of 350 mV, a well depth of at least 75 ke − for 90% of the pixels with a median dark current of 1.8 e − /sec. These arrays have demonstrated encouraging results as we move forward to extending the cutoff wavelength to 15 µm.

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Section: Prior Development / Neocammentioning

confidence: 99%

“…irradiated and demonstrated the ability to withstand the cosmic ray radiation that they are expected to receive in space. [12][13][14] These devices have reached NASA Technical Readiness Level-6.…”

Section: Prior Development / Neocammentioning

confidence: 99%

Development of 13-μm cutoff HgCdTe detector arrays for astronomy

Cabrera

McMurtry

Dorn

et al. 2019

J. Astron. Telesc. Instrum. Syst.

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“…Hawaii-1RG (H1RG) multiplexers [8][9][10] were chosen for the entire project because of the low power dissipation, ideal for passively cooled space missions, in addition to the small spread in the zero-bias point compared to other muxes. All four detector arrays had cutoff wavelengths ranging from 12.4 to 12.8 µm, measured at a temperature of 30 K. Two of the arrays (H1RG-18367 and 18508) had the same design as the LW10 detector arrays designed for the proposed NEOCam mission 7,11,12 extrapolated to longer wavelengths by decreasing the mole fraction of cadmium to mercury in the HgCdTe alloy, 13 while the other two arrays (H1RG-18369 and 18509) had two different TIS proprietary designs with the goal of mitigating quantum tunneling dark currents. 5,[14][15][16] The median dark current per pixel for three of the four arrays was below 1 e − /s at a temperature of 28 K and 150 mV of applied reverse bias, with a median well depth of ∼ 43 ke − .…”

Section: Lw13 Phase Summarymentioning

confidence: 99%

Characterization of a 15-μm cutoff HgCdTe detector array for astronomy

Cabrera

McMurtry

Forrest

et al. 2019

J. Astron. Telesc. Instrum. Syst.

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The University of Rochester infrared detector group is working together with Teledyne Imaging Sensors to develop HgCdTe 15 µm cutoff wavelength detector arrays for future space missions. To reach the 15 µm cutoff goal, we took an intermediate step by developing four ∼13 µm cutoff wavelength arrays to identify any unforeseen effects related to increasing the cutoff wavelength from the extensively characterized 10 µm cutoff wavelength detector arrays developed for the NEOCam mission. The characterization of the ∼13 µm cutoff wavelength HgCdTe arrays at the University of Rochester allowed us to determine the key dark current mechanisms that limit the performance of these HgCdTe detector arrays at different temperatures and bias when the cutoff wavelength is increased. We present initial dark current and well depth measurements of a 15 µm cutoff array which shows dark current values two orders of magnitude smaller at large reverse bias than would be expected from our previous best structures.

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15 micron cutoff HgCdTe Infrared Detector Arrays for Exo-Astronomy

Forrest¹,

Cabrera²,

McMurtry³

et al. 2019

Preprint

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The University of Rochester (UR) infrared detector group is working together with Teledyne Imaging Sensors to develop megapixel HgCdTe 15 µm cutoff wavelength (LW15) detector arrays for future space missions with the goal of identifying key components of biosignatures in the atmospheres of exoplanets. This technology could have the capability of identifying the 15 µm feature, seen in the three terrestrial planets orbiting in a habitable zone in our solar system. Further investigations of the habitability of such rocky planets would then be determined by the detection of abundant oxygen (from the 9.6 µm ozone feature) and water vapor in their spectra.

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Candidate 10 micron HgCdTe arrays for the NEOCam space mission

Cited by 5 publications

References 7 publications

Development of 13-μm cutoff HgCdTe detector arrays for astronomy

Development of 13-μm cutoff HgCdTe detector arrays for astronomy

Characterization of a 15-μm cutoff HgCdTe detector array for astronomy

15 micron cutoff HgCdTe Infrared Detector Arrays for Exo-Astronomy

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