By M. Henini, M. Razeghi
Using lasers which emit infra-red radiation and complicated detectors of IR radiation is expanding dramatically: they're getting used for long-distance fibre-optic communications and distant environmental tracking and sensing. hence they're of curiosity to the telecommunications and the army specifically. This publication has been designed to assemble what's recognized on those units, utilizing a world workforce of individuals.
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Additional info for Handbook of Infra-red Technologies
The cryogenically cooled InSb and HgCdTe arrays have comparable array size and pixel yield at MWIR spectral band. However, w a v e l e n g t h tunability and high quantum efficiency have made HgCdTe the preferred material. =3-3()~m) IR photodetectors. The short wavelength region has been dominated by III-V compounds (InGaAs, InAsSb, InGaSb). Spectral cut-off can be tailored by adjusting the HgCdTe alloy composition. Epitaxial techniques are the preferred technique to obtain device-quality HgCdTe material for IR devices.
In this case, electrons are thermally excited and tunnel through the barriers with assistance from the defects and the triangle part of the barrier at high bias. At high temperature (> 70K for kc=lOlam), thermally excited electrons are thermionically emitted and transport above the barriers. It is difficult to block this dark current without sacrificing the photoelectrons (transport mechanisms of thermionically emitted current and photocurrent are similar). Minimizing thermionically emitted current is critical to the commercial success of the QWIP, as it allows the highly desirable high-temperature camera operation.
HgCdTe detectors with background limited performance operate with thermoelectric coolers in the MWIR range. , ~< 12 lam) operate at ~1()()K. ",~j/... N. X,. ~HgCdTe Auger limited photoconductors x .. X 14 -3 " ' , ~ ~ ....... ~,.. n'-on-p PbSnTe Auger limited photodiodes ', "'~~' N~ = 10" cm3, t = 10 pm ",,, "--f. 100 Schott Q = 10 ~~ [__L 00 i i ] L__ 5 L . ~ L 10 Cutoff wavelength (lum) . . . . 15 1 ...... 8 Estimation of the temperature required for background limited operation of different types of photon detectors.