Electrical conductivity and dielectric relaxation behavior of fluorescein sodium salt (FSS)

✍ Scribed by Sh.A. Mansour; I.S. Yahia; G.B. Sakr

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 606 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.04.029

✦ Synopsis

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 E σ and the room temperature electrical conductivity equal 0.35 eV and 1.26×10 -9 ( cm) -1 , respectively. The alternating current (ac) conductivity of the investigated compound obeys the power law :

, 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.