Abstract
The electrical and optical absorption properties of 5-amino −2-(aryldiazenyl) phenol (HLn) was investigated. A semiconductor behavior with two thermal activation energies for dc conduction which are in the range 0.11–0.47eV for ΔE1 at the lower region of temperature and 0.77–1.12eV for ΔE2 at higher region of temperature are observed. The ac conductivity measurement showed a dependence of σac on test frequency following the relations σac∝ωS. Temperature dependence of the exponent S recommends different conduction mechanisms depends on the chemical structure. The recommended mechanism are small polaron tunneling (SPT) and quantum-mechanical tunneling mechanism (QMT). The optical absorption investigations for HLn thin films show that the ligands HL1 and HL2 experiences indirect optical transition with energy gap 2.02 and 1.89eV, respectively. The ligands HL3 and HL4 experiences direct optical energy gap with values 2.6 and 2.20eV, respectively.
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