voltages the illuminated material displays an increasing conductance with
increasing applied voltage. In contrast, at higher voltages (above about 3 V)
the phenomenon of decreasing conductance with increasing voltage, as
described by Eq. (10.13), is observed. Above an applied voltage of approximately
1 V, the ratio of conductance in the illuminated over the nonilluminated state is
more than an order of magnitude (Figure 10.26). At 5 V, this ratio reaches its
maximum of almost 50.
Figure 10.25 Dark current and photocurrent of CdS nanorods as a function of the applied
voltage. Note that the current is in a logarithmic scale. Illumination increases the current by more
than an order of magnitude [13].
Figure 10.26 Conductance of CdS as a function of the applied voltage for illuminated and nonilluminated nanorods. Above a voltage of 1 V, the conductance in the illuminated state is more
than one order of magnitude higher than in the dark [13].
10.3 Photoconductivity of Nanorods j287
increasing applied voltage. In contrast, at higher voltages (above about 3 V)
the phenomenon of decreasing conductance with increasing voltage, as
described by Eq. (10.13), is observed. Above an applied voltage of approximately
1 V, the ratio of conductance in the illuminated over the nonilluminated state is
more than an order of magnitude (Figure 10.26). At 5 V, this ratio reaches its
maximum of almost 50.
Figure 10.25 Dark current and photocurrent of CdS nanorods as a function of the applied
voltage. Note that the current is in a logarithmic scale. Illumination increases the current by more
than an order of magnitude [13].
Figure 10.26 Conductance of CdS as a function of the applied voltage for illuminated and nonilluminated nanorods. Above a voltage of 1 V, the conductance in the illuminated state is more
than one order of magnitude higher than in the dark [13].
10.3 Photoconductivity of Nanorods j287