Optimization of corrugated-QWIPs for large format, high quantum efficiency, and multi-color FPAs

Choi, K. K.; Monroy, C.; Swaminathan, V.; Tamir, T.; Leung, Ming; Devitt, John; Forrai, D. P.; Endres, D.

doi:10.1016/j.infrared.2006.10.003

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…Meanwhile, kinds of irradiance coupling regimes have been studied to facilitate the radiance absorption in QWIP devices. Besides the simplest 45℃ facet coupling, grating with optical cavity, random scatterer reflectors and corrugated coupling have been developed 5,6 . Nowadays, larger format QWIP FPAs with very low cost can be regularly produced as well as multicolor QWIP individual devices and FPA devices.…”

Section: Introductionmentioning

confidence: 99%

Design, fabrication, and characterization of quantum well infrared photoconductor in long-wavelength infrared

2011

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Optimum quantum well infrared photodetectors (QWIP) structure parameters such as well width and barrier height for a given peak detection wavelength of 8 μm were designed, based on which GaAs/AlGaAs material with designed structure was grown and single element QWIP devices were fabricated. In order to accurately calculate the optimum QWIP structure parameters including well width, barrier height and doping density etc., we took into account higher order effects such as band nonparabolicity in our calculations. One band effective mass approximation was employed in modeling and shooting method was used in calculation. We fabricated three kinds of QWIP samples that have 20, 40 and 60 periods of quantum wells respectively. I-V characteristic curves and photoresponse at different temperature were measured to characterize the detectors. A peak detectivity of 8×10 10 cmHz 1/2 /W was demonstrated by one of our QWIP devices. Besides, the varying performance of the three samples due to the different repeats of wells is discussed in this paper.

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Section: Introductionmentioning

confidence: 99%

Design, fabrication, and characterization of quantum well infrared photoconductor in long-wavelength infrared

2011

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“…Noda et al, [9] have grown InGaAs QWs with corrugated interface and investigated their transport and optical properties. Corrugated quantum well infrared photodetectors have attracted much recently for their selectionable detection wavelength [10,11].…”

Section: Introductionmentioning

confidence: 99%

The effect of nonparabolicity on binding energy of ground and excited states in a corrugated quantum well

Vanitha

Peter

2009

Superlattices and Microstructures

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“…However, due to their limited quantum efficiency and bandwidth, high sensitivity is achieved only at the expense of the detection speed. In order to reduce the integration time, the corrugated-QWIP structure was proposed and investigated [1,2,3,4]. In this paper, we will review and summarize these results.…”

Section: Introductionmentioning

confidence: 99%

C-QWIP focal plane array sensitivity

et al. 2009

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We are developing corrugated quantum well infrared photodetector (C-QWIP) technology for long wavelength applications. A number of large format 1024 × 1024 C-QWIP focal plane arrays (FPAs) have been demonstrated. The measured quantum efficiency η is ranging from 15 -37%, depending on the detector type, doping density and number of quantum wells in the detector material. The photoconductive gain is between 0.07 and 0.19, while the spectral width is between 1.5 and 3.5 microns. Despite the large integrated η of the C-QWIPs, the number of collected photoelectrons can be limited in shorter cutoff, small pixel FPAs under high speed operation. In this case, the read noise will have a large impact on the system sensitivity. In this paper, we will discuss the detector model, the measured pixel characteristics, and the effects of read noise on the FPA performance. Our analysis shows that the tolerable read noise improves with the cutoff wavelength. For example, to achieve a sensitivity of 20 mK at 2 msec integration time, the respective read noise will be 1000, 2000, 3000, and 4000 e¯ at λ c = 8. 8, 9.4, 10.7 and 11.7 μm. This analysis will help to determine the read noise requirement for the C-QWIP FPAs.

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Optimization of corrugated-QWIPs for large format, high quantum efficiency, and multi-color FPAs

Cited by 13 publications

References 8 publications

Design, fabrication, and characterization of quantum well infrared photoconductor in long-wavelength infrared

Design, fabrication, and characterization of quantum well infrared photoconductor in long-wavelength infrared

The effect of nonparabolicity on binding energy of ground and excited states in a corrugated quantum well

C-QWIP focal plane array sensitivity

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