GaAs/InGaAs far-infrared quantum well photodetectors based on a bound-to-continuum intersubband transition with a (zero response) cutoff wavelength of 35 μm are reported. A peak responsivity of 0.45 A/W and detectivity of at a wavelength of 31 μm and a temperature of 4.2 K have been experimentally achieved. Infrared response was observed at temperatures up to 18 K. A calculated responsivity spectrum using a bound-to-continuum line shape corrected for phonon absorption is fitted to the experimental response. The calculated line shape without absorption gives a cutoff wavelength of 38 μm with a peak responsivity of 0.50 A/W and a detectivity of at 32 μm.
REFERENCES
1.
2.
S. D. Gunapala and S. V. Bandara, “Quantum Well IR Photodetector Focal Plane Arrays,” in Semiconductors and Semimetals Vol. 62, edited by H. C. Liu and F. Capasso (Academic, San Diego, 2000), pp. 197–291.
3.
A. G. U.
Perera
, W. Z.
Shen
, S. G.
Matsik
, H. C.
Liu
, M.
Buchanan
, and W. J.
Schaff
, Appl. Phys. Lett.
72
, 1596
(1998
).4.
P. W. Pellegrini and J. R. Jimenez, “Thin Film Epitaxial Layers on Silicon for the Detection of Infrared Signals,” The Physics of Thin Films Vol. 23 (Academic, San Diego, 1998), p. 115.
5.
H. C.
Liu
, Z. R.
Wasilewski
, M.
Buchanan
, and H.
Chu
, Appl. Phys. Lett.
63
, 761
(1993
).6.
O.
Brafman
, D.
Fekete
, and R.
Sarfaty
, Appl. Phys. Lett.
58
, 400
(1991
).7.
J.
Li
, H. C.
Liu
, M.
Buchanan
, Z. R.
Wasilewski
, and J. G.
Simmons
, J. Appl. Phys.
75
, 1748
(1994
).8.
K. K. Choi, The Physics of Quantum Well Infrared Photodetectors (World Scientific, Singapore, 1997).
9.
10.
11.
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