Abstract
The ac and dc electrical conductivities and dielectric properties of the fluorescein sodium salt (FSS) have been investigated. The direct current (dc) conductivity shows that the compound is a typical organic semiconductor, as its electrical conductivity increases with increasing temperature. The dc electrical activation energy
Δ
E
σ
and the room temperature electrical conductivity equal 0.35 eV and
1.26
×
1
0
−
9
(
Ω
cm
)
−
1
, respectively. The alternating current (ac) conductivity of the investigated compound obeys the power law :
σ
a
c
(
ω
)
=
A
(
T
)
.
ω
s
(
T
)
, where
s
<
1
. The obtained results have been discussed in terms of the correlated barrier hopping (CBH) model. The density of localized states
N
F
(
E
)
at the Fermi level and the binding energy
W
m
were calculated. The dielectric constant
ε
1
(
ω
)
and dielectric loss
ε
2
(
ω
)
have been found to decrease with increasing frequency and to increase with increasing temperature over the studied ranges. The value of the maximum barrier height
W
M
obtained from Austin and Guintini equations agree with each other. The correlation between the ac conduction and the dielectric properties in organic FSS were verified.