Chemistry Reference
In-Depth Information
FIGURE 11.17
Volt-current characteristics of Al/sp
1
-C/p-Si heterojunction (a) and
schematic representation of energy band diagram (b).
11.4.10 C
OLD
E
LECTRON
E
MISSION
The surface of the sp
1
-carbon film was examined as a cold emitter of elec-
trons in a normal applied electric field.
Figure 11.18
shows the volt-current
characteristic of a vacuum diode with a flat sp
1
-carbon cathode at room
temperature. The figure is plotted in the Schottky coordinates log(I)
U
1/2
where U is the applied voltage. The distance between the anode and cathode
was about 0.3mm. As can be seen in
Figure 11.18
, the electron emission
from the cathode can be described by the Schottky law:
e
3
=
2
U
1
=
2
log I
ðÞ¼
=
kT,
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