Inefficiency of intervalley transfer in narrow InGaAs/AlAsSb quantum wells

Tribuzy, Christiana Villas-Bôas; Ohser, Sabine; Priegnitz, Marlen; Winnerl, Stephan; Schneider, Harald; Helm, M.; Neuhaus, Joerg; Dekorsy, Thomas; Biermann, K.; Künzel, H.

doi:10.1002/pssc.200776556

Cited by 5 publications

(1 citation statement)

References 12 publications

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“…Also, in a thin In Ga As QW the upper level, , lies above the lowest X-valley point for ISB transition energiesmeV (3.7 m) [29], wherefore inter-valley scattering is expected to degrade the extraction efficiency and thus the overall performance of short wavelength InGaAs QCDs. Fortunately, inter-valley scattering was recently shown to be much slower in thin InGaAs-AlAsSb QWs as compared with bulk InGaAs [30].…”

Section: B Near-infrared Qcdsmentioning

confidence: 99%

Quantum Cascade Detectors

Giorgetta

Baumann

Graf

et al. 2009

IEEE J. Quantum Electron.

200

126

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Abstract-This paper gives an overview on the design, fabrication, and characterization of quantum cascade detectors. They are tailorable infrared photodetectors based on intersubband transitions in semiconductor quantum wells that do not require an external bias voltage due to their asymmetric conduction band profile. They thus profit from favorable noise behavior, reduced thermal load, and simpler readout circuits. This was demonstrated at wavelengths from the near infrared at 2 m to THz radiation at 87 m using different semiconductor material systems. In the NIR, fast intraband semiconductor photodetectors are only available for wavelengths up to about 1.6 m. On the other tail of optical frequencies, namely for detection of THz radiation, bolometers are widely used; however, they are not well suited for high-speed applications. For fast light detection at wavelengths above 1.6 m, ISB photodetectors are very promising candidates. As unipolar devices, their fundamental F. R. Giorgetta was with the University of Neuchatel, 2000 Neuchatel, Switzerland. He is now with the National

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Section: B Near-infrared Qcdsmentioning

confidence: 99%