Photoconductive HgCdTe detector performance with background variations

Borrello, S.R.; Kinch, M. A.; Lamont, D.

doi:10.1016/0020-0891(77)90104-x

Cited by 29 publications

(9 citation statements)

References 5 publications

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“…No spectroscopic evidence of nonlinearity (such as the presence of high frequency overtones of sharp bands) was observed. Very recently Borrello et al (11) have reported that the D* of the MCT detector should vary approximately with the square root of the background flux above a certain threshold, and our results agree quantitatively with their calculations. Hirschfeld (12) has also suggested that part of the reduction in S/N at high photon flux is caused by the increase in photon shot noise.…”

Section: Instrumentationsupporting

confidence: 90%

Dual-beam Fourier transform infrared spectrometer

Kuehl¹,

Griffiths²

1978

Anal. Chem.

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Section: Instrumentationsupporting

confidence: 90%

Dual-beam Fourier transform infrared spectrometer

Kuehl¹,

Griffiths²

1978

Anal. Chem.

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“…It may be seen from this table that for the case of [19] and [20] the experimental values of Q f , N d , τ b and η as reported by these authors vary within the ranges indicated in this table. In view of this, we calculated D * λ for two extreme cases, namely taking a combination of worst and best case values for each of these parameters.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 50%

Analysis of the effect of surface passivant charges on HgCdTe photoconductive detectors

Pal

Bhan

Chhabra

et al. 1996

Semicond. Sci. Technol.

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The effect of fixed surface charge density (Q f ) on the performance of HgCdTe (MCT) photoconductive detectors is presented in this study. The figure of merit such as the specific detectivity (D * ) of Hg 0.78 Cd 0.22 Te photoconductive detectors operating at 77 K is calculated with 300 K background and 2π field of view (FOV). The equations leading to the above calculations are developed for the case of a one-dimensional model. Our calculations show that: (i) D * shows maxima with varying Q f ; (ii) improvement in D * due to accumulation is observed for values of Q f up to 5 × 10 10 cm −2 for materials with low as well as high bulk minority carrier lifetimes (τ b ); and (iii) D * is limited by shunt resistance due to passivants having Q f > 5 × 10 10 cm −2 for low-τ b materials. Furthermore, D * is found to degrade by an order of magnitude from its peak value with increase in Q f from 5 × 10 10 cm −2 to 1 × 10 13 cm −2 in a material having τ b = 10 ns, whereas no such degradation in D * is seen for the same range of Q f in a material having τ b ≥ 1 µs. In addition, our calculations predict that the accumulation layer improves D * by a factor of 1.5 for surfaces having an initial surface recombination velocity as high as 10 5 cm s −1 .

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“…Borrello et al, 1977;Abrams et al, 1994), laboratory tests have shown the emission radiometer instruments to respond nearly linearly to blackbody radiation over much of their measurement range. Assuming such an idealized linear relationship, the instrument is modelled such that detector response S at a given wavenumber ν , altitude z, and incident radiance spectrum I for a given effective viewing angleθ be given by:…”

Section: Instrument Forward Modelmentioning

confidence: 99%

Balloon-borne radiometer measurements of Northern Hemisphere mid-latitude stratospheric HNO<sub>3</sub> profiles spanning 12 years

et al. 2007

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Abstract. Low-resolution atmospheric thermal emission spectra collected by balloon-borne radiometers over the time span of 1990-2002 are used to retrieve vertical profiles of HNO 3 , CFC-11 and CFC-12 volume mixing ratios between approximately 10 and 35 km altitude. All of the data analyzed have been collected from launches from a Northern Hemisphere mid-latitude site, during late summer, when stratospheric dynamic variability is at a minimum. The retrieval technique incorporates detailed forward modeling of the instrument and the radiative properties of the atmosphere, and obtains a best fit between modeled and measured spectra through a combination of onion-peeling and optimization steps. The retrieved HNO 3 profiles are consistent over the 12-year period, and are consistent with recent measurements by the Atmospheric Chemistry Experiment-Fourier transform spectrometer satellite instrument. We therefore find no evidence of long-term changes in the HNO 3 summer mid-latitude profile, although the uncertainty of our measurements precludes a conclusive trend analysis.

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Photoconductive HgCdTe detector performance with background variations

Cited by 29 publications

References 5 publications

Dual-beam Fourier transform infrared spectrometer

Dual-beam Fourier transform infrared spectrometer

Analysis of the effect of surface passivant charges on HgCdTe photoconductive detectors

Balloon-borne radiometer measurements of Northern Hemisphere mid-latitude stratospheric HNO<sub>3</sub> profiles spanning 12 years

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Photoconductive HgCdTe detector performance with background variations

Cited by 29 publications

References 5 publications

Dual-beam Fourier transform infrared spectrometer

Dual-beam Fourier transform infrared spectrometer

Analysis of the effect of surface passivant charges on HgCdTe photoconductive detectors

Balloon-borne radiometer measurements of Northern Hemisphere mid-latitude stratospheric HNO&lt;sub&gt;3&lt;/sub&gt; profiles spanning 12 years

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Balloon-borne radiometer measurements of Northern Hemisphere mid-latitude stratospheric HNO<sub>3</sub> profiles spanning 12 years