Chemistry Reference
In-Depth Information
(a)
E
0
E
F
n
+
-GaAs
AlGaAs
GaAs
AlGaAs
n
+
-GaAs
(b)
e
V
b
(c)
e
V
c
Position
(d)
B
C
A
Voltage
Figure 5.19
(a)-(c) The variation in the conduction band line-up with increasing
applied bias in a double barrier structure. (d) The current-voltage char-
acteristic for such a structure. The current is peaked about the point B
where resonant tunnelling is possible, and can show a strong negative
differential resistance as the bound state moves off-resonance in (c).
