DOI: 10.1063/1.363043. Comment on ‘‘Temperature limits on infrared detectivities of InAs/InxGa1−xSb superlattices and bulk Hg1−xCdxTe’’ [J. Appl. Phys. 74, 4774 (1993)]

Comment on ‘‘Temperature limits on infrared detectivities of InAs/InxGa1−xSb superlattices and bulk Hg1−xCdxTe’’ [J. Appl. Phys. 74, 4774 (1993)]

10.1063/1.363043

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

Three papers published recently [P. M. Young, C. H. Grein, H. Ehrenreich, and R. H. Miles, J. Appl. Phys. 74, 4774 (1993); G. M. Williams, J. Appl. Phys. 77, 4153 (1995); C. H. Grein, M. E. Flatte, H. Ehrenreich, and R. H. Miles, J. Appl. Phys. 77, 4156 (1995)] concerning the comparison of theoretically predicted performance of HgCdTe photodiodes with InAs/InGaSb superlattice photovoltaic detectors are obscure with respect to optimal selection of HgCdTe photodiode structures. Both Comments [G. M. Williams, J. Appl. Phys. 77, 4153 (1995); C. H. Grein, M. E. Flatte, H. Ehrenreich, and R. H. Miles, J. Appl. Phys. 77, 4156 (1995)] have not noticed the important results of papers published by Humpreys [Infrared Phys. 23, 171 (1983); Infrared Phys. 26, 337 (1986)], who critically reexamined the role of a radiative mechanism in the detection of infrared radiation. To explain our point of view on competition between InAs/InGaSb SLs and ‘‘bulk’’ HgCdTe detectors, we present a generalized model of an infrared photodetector and derive the figure merit of any material for infrared photodetector as the ratio of absorption coefficient to the thermal generation rate. This determines the detectivity of infrared photodetectors. Using that model for the most common n+-p and p+-n long wavelength HgCdTe photodiodes, it is shown that the highest performance can be obtained with a low doping of the base photodiode regions. This means that the previously assumed (Young et al.) highly doped HgCdTe photodiode structure with a thick base region is far from optimal. Our calculations carried out for optimal device structures indicate that the ultimate detectivities of long wavelength HgCdTe photodiodes operating at 77 K are higher than those for InAs/InGaSb SLs.

Bibliography

Piotrowski, J., & Rogalski, A. (1996). Comment on ââTemperature limits on infrared detectivities of InAs/InxGa1âxSb superlattices and bulk Hg1âxCdxTeââ [J. Appl. Phys. 74, 4774 (1993)]. Journal of Applied Physics, 80(4), 2542â2544.

Authors 2

J. Piotrowski (first)
A. Rogalski (additional)

References 26 Referenced 30

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:52 a.m.)
Deposited	1 year, 6 months ago (Feb. 2, 2024, 1:43 p.m.)
Indexed	4 weeks, 1 day ago (July 30, 2025, 11:19 a.m.)
Issued	29 years ago (Aug. 15, 1996)
Published	29 years ago (Aug. 15, 1996)
Published Print	29 years ago (Aug. 15, 1996)

Funders 0

None

BibTeX

@article{Piotrowski_1996, title={Comment on ‚Äò‚ÄúTemperature limits on infrared detectivities of InAs/InxGa1‚àíxSb superlattices and bulk Hg1‚àíxCdxTe‚Äù‚Äô [J. Appl. Phys. 74, 4774 (1993)]}, volume={80}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.363043}, DOI={10.1063/1.363043}, number={4}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Piotrowski, J. and Rogalski, A.}, year={1996}, month=aug, pages={2542‚Äì2544} }

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