Medium-wavelength, normal-incidence, p -type Si/SiGe quantum well infrared photodetector with background limited performance up to 85 K
1996; American Institute of Physics; Volume: 69; Issue: 22 Linguagem: Inglês
10.1063/1.117263
ISSN1520-8842
AutoresP. Kruck, M. Helm, Thomas Fromherz, G. Bauer, J. F. Nützel, G. Abstreiter,
Tópico(s)Nanowire Synthesis and Applications
ResumoThe detector characteristics of a pseudomorphic p-type Si0.64Ge0.36/Si quantum well infrared photodetector are reported. The device exhibits a photoresponse between 3 and 8 μm with a peak responsivity of Rp=76 mA/W, at a peak wavelength of λp=5 μm, resulting in a detectivity as high as Dλ*=2×1010 cm√Hz/W at a temperature of T=77 K. Background limited infrared performance is achieved up to T=85 K. Investigation of the polarization dependence shows that in-plane polarized radiation produces the largest photoresponse, thus making normal-incidence detection feasible. The relevant optical transitions are analyzed on the basis of a self-consistent 6-band Luttinger–Kohn calculation including the in-plane dispersion.
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