250
QUANTUM WELLS, WIRES, AND DOTS
1 00
t
Y
U
d
t
1
Figure 9.21. Dark-current density versus bias voltage characteristics for a GaAs/AIGaAs
quantum-well long-wavelength infrared (LWIR) photodetector measured at three indicated
temperatures. A 300-K background current plot (BG, dashed curve) is also shown. [From
M. Z. Tidrow, J. C. Chiang, S. S. Li, and K. Bacher, Appl. Phys. Lett. 70, 859 (1997).]
0.6 I I 1 1 1 I I I , ) I I I I I I I I I I I 1 1 I I I I I I
LWIR: T = 77 K, bias = 2 V
WAVELENGTH (pm)
(a)
Figure 9.22. Peak responsivity versus wavelength at 77K for a 2-V bias at normal and 45"
angles of incidence. [From M. Z. Tidrow, J. C. Chiang, S. S. Li, and K. Bacher, Appl. Phys. Lett.
70, 859 (1997).]